diff --git a/assets/locales/de.json b/assets/locales/de.json
index b369b424..76960a33 100644
--- a/assets/locales/de.json
+++ b/assets/locales/de.json
@@ -600,6 +600,7 @@
   "cmd.parameters_delete": "Parameter löschen",
   "cmd.parameters_export": "Parameter exportieren",
   "cmd.parameters_favorite": "Favorisierter Parameter",
+  "cmd.parameters_move": "Parameter verschieben",
   "cmd.parameters_graph": "Parametergraph",
   "cmd.parameters_import": "Parameter importieren",
   "cmd.parameters_list": "Parameter auflisten",
diff --git a/assets/locales/en.json b/assets/locales/en.json
index 43a426f8..f8810357 100644
--- a/assets/locales/en.json
+++ b/assets/locales/en.json
@@ -151,6 +151,7 @@
   "cmd.parameters_delete": "Delete Parameter",
   "cmd.parameters_export": "Export Parameters",
   "cmd.parameters_favorite": "Favourite Parameter",
+  "cmd.parameters_move": "Move Parameter",
   "cmd.parameters_graph": "Parameter Graph",
   "cmd.parameters_import": "Import Parameters",
   "cmd.parameters_list": "List Parameters",
diff --git a/assets/locales/fr.json b/assets/locales/fr.json
index bf42e9bf..a2decd8c 100644
--- a/assets/locales/fr.json
+++ b/assets/locales/fr.json
@@ -141,6 +141,7 @@
   "cmd.parameters_delete": "Supprimer le paramètre",
   "cmd.parameters_export": "Exporter les paramètres",
   "cmd.parameters_favorite": "Paramètre favori",
+  "cmd.parameters_move": "Déplacer le paramètre",
   "cmd.parameters_graph": "Graphe des paramètres",
   "cmd.parameters_import": "Importer des paramètres",
   "cmd.parameters_list": "Lister les paramètres",
diff --git a/assets/locales/ja.json b/assets/locales/ja.json
index 2f8dac30..d5b04f5b 100644
--- a/assets/locales/ja.json
+++ b/assets/locales/ja.json
@@ -151,6 +151,7 @@
   "cmd.parameters_delete": "パラメータを削除",
   "cmd.parameters_export": "パラメータをエクスポート",
   "cmd.parameters_favorite": "お気に入りパラメータ",
+  "cmd.parameters_move": "パラメータを移動",
   "cmd.parameters_graph": "パラメータ グラフ",
   "cmd.parameters_import": "パラメータをインポート",
   "cmd.parameters_list": "パラメータを一覧表示",
diff --git a/assets/locales/ko.json b/assets/locales/ko.json
index debb6431..f0e72e3f 100644
--- a/assets/locales/ko.json
+++ b/assets/locales/ko.json
@@ -600,6 +600,7 @@
   "cmd.parameters_delete": "매개 변수 삭제",
   "cmd.parameters_export": "매개 변수 내보내기",
   "cmd.parameters_favorite": "즐겨찾는 매개 변수",
+  "cmd.parameters_move": "매개 변수 이동",
   "cmd.parameters_graph": "매개 변수 그래프",
   "cmd.parameters_import": "매개 변수 가져오기",
   "cmd.parameters_list": "매개 변수 목록",
diff --git a/assets/locales/ru.json b/assets/locales/ru.json
index 509e91d3..1cb1c169 100644
--- a/assets/locales/ru.json
+++ b/assets/locales/ru.json
@@ -140,6 +140,7 @@
   "cmd.parameters_delete": "Удалить параметр",
   "cmd.parameters_export": "Экспортировать параметры",
   "cmd.parameters_favorite": "Избранный параметр",
+  "cmd.parameters_move": "Переместить параметр",
   "cmd.parameters_graph": "График параметра",
   "cmd.parameters_import": "Импортировать параметры",
   "cmd.parameters_list": "Список параметров",
diff --git a/assets/locales/uk.json b/assets/locales/uk.json
index d296994c..9c572138 100644
--- a/assets/locales/uk.json
+++ b/assets/locales/uk.json
@@ -141,6 +141,7 @@
   "cmd.parameters_delete": "Видалити параметр",
   "cmd.parameters_export": "Експортувати параметри",
   "cmd.parameters_favorite": "Обраний параметр",
+  "cmd.parameters_move": "Перемістити параметр",
   "cmd.parameters_graph": "Граф параметрів",
   "cmd.parameters_import": "Імпортувати параметри",
   "cmd.parameters_list": "Список параметрів",
diff --git a/assets/locales/zh.json b/assets/locales/zh.json
index 656a0459..478f2171 100644
--- a/assets/locales/zh.json
+++ b/assets/locales/zh.json
@@ -151,6 +151,7 @@
   "cmd.parameters_delete": "删除参数",
   "cmd.parameters_export": "导出参数",
   "cmd.parameters_favorite": "收藏参数",
+  "cmd.parameters_move": "移动参数",
   "cmd.parameters_graph": "参数关系图",
   "cmd.parameters_import": "导入参数",
   "cmd.parameters_list": "列出参数",
diff --git a/crates/doc/src/params.rs b/crates/doc/src/params.rs
index ae18f4a0..0115397c 100644
--- a/crates/doc/src/params.rs
+++ b/crates/doc/src/params.rs
@@ -352,6 +352,25 @@ impl Document {
         rows
     }
 
+    /// Move user parameter `name` to just before (or with `after`, just after) user parameter
+    /// `target`: the order the Parameters dialog lists them in. Nothing else changes.
+    pub fn move_user_param(&mut self, name: &str, target: &str, after: bool) -> Result<()> {
+        fn user(params: &[crate::Param], n: &str) -> Option<usize> {
+            params.iter().position(|p| p.name == n && !p.model)
+        }
+        let (Some(from), Some(_)) = (user(&self.params, name), user(&self.params, target)) else {
+            let missing = if user(&self.params, name).is_none() { name } else { target };
+            return Err(DocError::Unknown(format!("user parameter `{missing}`")));
+        };
+        if name == target {
+            return Err(DocError::Invalid("a parameter cannot move next to itself".into()));
+        }
+        let moved = self.params.remove(from);
+        let at = user(&self.params, target).map_or(self.params.len(), |i| if after { i + 1 } else { i });
+        self.params.insert(at, moved);
+        Ok(())
+    }
+
     pub fn set_favorite(&mut self, name: &str, on: bool) -> Result<()> {
         if !self.name_taken(name) {
             return Err(DocError::Unknown(format!("parameter `{name}`")));
diff --git a/crates/engine/src/cmd/parameters.rs b/crates/engine/src/cmd/parameters.rs
index aa3c2147..47756fe7 100644
--- a/crates/engine/src/cmd/parameters.rs
+++ b/crates/engine/src/cmd/parameters.rs
@@ -24,6 +24,8 @@ pub static COMMANDS: &[CommandSpec] = &[
         .params("name, new_name (expressions, feature inputs and dimensions that use it follow)"),
     CommandSpec::new("parameters.delete", "Delete Parameter", delete).params("name (refused while something uses it; the error lists the users)"),
     CommandSpec::new("parameters.favorite", "Favourite Parameter", favorite).params("name, favorite?: bool (default true)"),
+    CommandSpec::new("parameters.move", "Move Parameter", move_param)
+        .params("name, before | after: another user parameter; the user parameter is listed just before or after it"),
     CommandSpec::new("parameters.comment", "Comment Parameter", comment).params("name, comment"),
     CommandSpec::new("parameters.users", "Parameter Users", users)
         .noundo()
@@ -179,6 +181,19 @@ fn favorite(s: &mut Session, p: &Value) -> Result<Value> {
     Ok(json!({"name": name, "favorite": on}))
 }
 
+fn move_param(s: &mut Session, p: &Value) -> Result<Value> {
+    let cmd = "parameters.move";
+    let name = param_name(cmd, p)?.to_string();
+    let (target, after) = match (str_(p, "before"), str_(p, "after")) {
+        (Some(t), None) => (t.to_string(), false),
+        (None, Some(t)) => (t.to_string(), true),
+        _ => return Err(bad(cmd, "give one of `before` or `after`: another user parameter")),
+    };
+    s.doc_mut().move_user_param(&name, &target, after)?;
+    let order: Vec<&str> = s.doc.params.iter().filter(|q| !q.model).map(|q| q.name.as_str()).collect();
+    Ok(json!({"name": name, "order": order}))
+}
+
 fn comment(s: &mut Session, p: &Value) -> Result<Value> {
     let cmd = "parameters.comment";
     let name = param_name(cmd, p)?.to_string();
diff --git a/crates/engine/src/cmd/parameters_tests.rs b/crates/engine/src/cmd/parameters_tests.rs
index a4b54aee..1b9601e4 100644
--- a/crates/engine/src/cmd/parameters_tests.rs
+++ b/crates/engine/src/cmd/parameters_tests.rs
@@ -544,3 +544,52 @@ fn switching_configurations_back_reuses_the_later_features() {
     assert!(rel(volume(&mut s), 40.0 * 30.0 * 10.0) < 1e-9);
     assert!(hits(&s) > before, "{r}");
 }
+
+/// The user parameters' names in the order the Parameters dialog lists them.
+fn user_order(s: &mut Session) -> Vec<String> {
+    let v = run(s, "parameters.list", json!({"filter": "user"}));
+    v["parameters"].as_array().unwrap().iter().map(|r| r["name"].as_str().unwrap().to_string()).collect()
+}
+
+#[test]
+fn user_parameters_reorder_with_undo() {
+    // #1187: move a user parameter before or after another; nothing else changes.
+    let mut s = Session::default();
+    for (n, e) in [("a", "1 mm"), ("b", "2 mm"), ("c", "a + b")] {
+        run(&mut s, "parameters.add", json!({"name": n, "expression": e}));
+    }
+    assert_eq!(user_order(&mut s), ["a", "b", "c"]);
+    let r = run(&mut s, "parameters.move", json!({"name": "c", "before": "a"}));
+    assert_eq!(r["order"], json!(["c", "a", "b"]));
+    assert_eq!(user_order(&mut s), ["c", "a", "b"]);
+    run(&mut s, "parameters.move", json!({"name": "c", "after": "a"}));
+    assert_eq!(user_order(&mut s), ["a", "c", "b"]);
+    // Values and references are untouched; the order is kept in the design file.
+    let list = run(&mut s, "parameters.list", json!({"filter": "user"}));
+    let c = list["parameters"].as_array().unwrap().iter().find(|r| r["name"] == "c").unwrap().clone();
+    assert_eq!(c["expression"], "a + b");
+    assert!((c["value"].as_f64().unwrap() - 3.0).abs() < 1e-9, "{c}");
+    let back = Session::new(solidcraft_doc::Document::from_json(&s.doc.to_json()).unwrap());
+    let names: Vec<&str> = back.doc.params.iter().filter(|p| !p.model).map(|p| p.name.as_str()).collect();
+    assert_eq!(names, ["a", "c", "b"]);
+    run(&mut s, "edit.undo", json!({}));
+    assert_eq!(user_order(&mut s), ["c", "a", "b"]);
+}
+
+#[test]
+fn moving_a_parameter_refuses_bad_targets() {
+    let mut s = Session::default();
+    run(&mut s, "parameters.add", json!({"name": "a", "expression": "1 mm"}));
+    run(&mut s, "parameters.add", json!({"name": "b", "expression": "2 mm"}));
+    let before = s.doc.to_json();
+    for p in [
+        json!({"name": "a", "before": "a"}),
+        json!({"name": "a", "before": "nope"}),
+        json!({"name": "nope", "before": "a"}),
+        json!({"name": "a"}),
+        json!({"name": "a", "before": "b", "after": "b"}),
+    ] {
+        err(&mut s, "parameters.move", p);
+    }
+    assert_eq!(s.doc.to_json(), before);
+}
diff --git a/crates/ui-egui/src/params_dialog.rs b/crates/ui-egui/src/params_dialog.rs
index 906d102b..d2cc46e9 100644
--- a/crates/ui-egui/src/params_dialog.rs
+++ b/crates/ui-egui/src/params_dialog.rs
@@ -226,12 +226,30 @@ fn table(app: &mut SolveApp, ui: &mut egui::Ui, d: &mut ParamsDialog, rows: &[&R
             ui.label(RichText::new(h).color(t.text_dim).small());
         }
         ui.end_row();
-        for r in rows {
-            // Favourite star.
-            let star = if r.favorite { RichText::new("★").color(t.accent) } else { RichText::new("☆").color(t.text_dim) };
-            if ui.add(egui::Button::new(star).frame(false)).on_hover_text(crate::i18n::tr_label("Favourite")).clicked() {
-                d.error = app.run("parameters.favorite", json!({"name": r.name, "favorite": !r.favorite})).err();
-            }
+        for (i, r) in rows.iter().enumerate() {
+            ui.horizontal(|ui| {
+                // Favourite star.
+                let star = if r.favorite { RichText::new("★").color(t.accent) } else { RichText::new("☆").color(t.text_dim) };
+                if ui.add(egui::Button::new(star).frame(false)).on_hover_text(crate::i18n::tr_label("Favourite")).clicked() {
+                    d.error = app.run("parameters.favorite", json!({"name": r.name, "favorite": !r.favorite})).err();
+                }
+                // Up and down past the neighbouring user parameter (#1187), in the user table only:
+                // the favourites table lists favourites first whatever their order.
+                if salt == "user" {
+                    for (glyph, tip, neighbour, side) in
+                        [("▲", "Move up", i.checked_sub(1).and_then(|j| rows.get(j)), "before"), ("▼", "Move down", rows.get(i + 1), "after")]
+                    {
+                        let button = egui::Button::new(RichText::new(glyph).small().color(t.text_dim)).frame_when_inactive(false);
+                        let resp = ui.add_enabled(neighbour.is_some(), button).on_hover_text(crate::i18n::tr_label(tip));
+                        crate::scenario::publish_handle(&format!("param:{}:{}", side, r.name), resp.rect.center());
+                        if resp.clicked()
+                            && let Some(n) = neighbour
+                        {
+                            d.error = app.run("parameters.move", json!({"name": r.name, side: n.name})).err();
+                        }
+                    }
+                }
+            });
             // Name: double-click to rename.
             match &mut d.renaming {
                 Some((old, new)) if *old == r.name => {
diff --git a/crates/ui-egui/tests/parameter_order.rs b/crates/ui-egui/tests/parameter_order.rs
new file mode 100644
index 00000000..57834441
--- /dev/null
+++ b/crates/ui-egui/tests/parameter_order.rs
@@ -0,0 +1,30 @@
+//! The Parameters dialog's ▲ / ▼ buttons reorder user parameters (#1187).
+use serde_json::json;
+use solidcraft_ui_egui::scenario::Harness;
+
+fn order(h: &mut Harness) -> Vec<String> {
+    let v = h.app.session.execute("parameters.list", &json!({"filter": "user"})).unwrap();
+    v["parameters"].as_array().unwrap().iter().map(|r| r["name"].as_str().unwrap().to_string()).collect()
+}
+
+#[test]
+fn arrows_move_user_parameters_up_and_down() {
+    let mut h = Harness::new();
+    for (n, e) in [("a", "1 mm"), ("b", "2 mm"), ("c", "3 mm")] {
+        h.app.session.execute("parameters.add", &json!({"name": n, "expression": e})).unwrap();
+    }
+    h.step(&json!({"widget":"Parameters"})).unwrap();
+    assert!(h.app.params.is_some());
+    h.frames(3);
+    h.run(&json!([{"click":{"handle":"param:after:a"}}])).unwrap();
+    h.frames(2);
+    assert_eq!(order(&mut h), ["b", "a", "c"]);
+    h.run(&json!([{"click":{"handle":"param:before:c"}}])).unwrap();
+    h.frames(2);
+    assert_eq!(order(&mut h), ["b", "c", "a"]);
+    // The first row cannot move up, the last cannot move down.
+    h.run(&json!([{"click":{"handle":"param:before:b"}}, {"click":{"handle":"param:after:a"}}])).unwrap();
+    h.frames(2);
+    assert_eq!(order(&mut h), ["b", "c", "a"]);
+    assert!(h.app.params.as_ref().unwrap().error.is_none());
+}
diff --git a/docs/features.md b/docs/features.md
index d624bc61..8c4a2335 100644
--- a/docs/features.md
+++ b/docs/features.md
@@ -1,6 +1,6 @@
 # Features
 
-SolidCraft's commands by area, generated by `cargo xtask features` from the command registry (`solidcraft-cli commands`). **365 commands.** Planned (registered, not built yet): 4. Every command runs the same way from the toolbar, a script, `solidcraft-cli exec <id> '<json>'`, the control channel and MCP; parameters are in the [command reference](book/src/reference/commands.md) (`cargo xtask book`). Status and plans: [ROADMAP](../ROADMAP.md).
+SolidCraft's commands by area, generated by `cargo xtask features` from the command registry (`solidcraft-cli commands`). **367 commands.** Planned (registered, not built yet): 4. Every command runs the same way from the toolbar, a script, `solidcraft-cli exec <id> '<json>'`, the control channel and MCP; parameters are in the [command reference](book/src/reference/commands.md) (`cargo xtask book`). Status and plans: [ROADMAP](../ROADMAP.md).
 
 ## Sketch (99)
 
@@ -315,7 +315,7 @@ SolidCraft's commands by area, generated by `cargo xtask features` from the comm
 | Measure (I) | `inspect.measure` | SOLID › INSPECT |
 | Section Analysis | `inspect.section` | SOLID › INSPECT |
 
-## Files (7)
+## Files (8)
 
 | Command | Id | Toolbar |
 |---|---|---|
@@ -325,7 +325,8 @@ SolidCraft's commands by area, generated by `cargo xtask features` from the comm
 | Save (Ctrl+S) | `file.save` | – |
 | Save As | `file.save_as` | – |
 | Export | `file.export` | – |
-| Save As Mesh | `file.save_mesh` | – |
+| Save As Mesh | `file.save_mesh` | MESH › MODIFY |
+| Installed Slicers | `file.slicers` | – |
 
 ## Documents (4)
 
@@ -462,7 +463,7 @@ SolidCraft's commands by area, generated by `cargo xtask features` from the comm
 
 | Command | Id | Toolbar |
 |---|---|---|
-| Convert Mesh | `mesh.convert` | MESH › MODIFY |
+| Convert Mesh | `mesh.convert` | – |
 
 ## `model.*` (3)
 
@@ -491,7 +492,7 @@ SolidCraft's commands by area, generated by `cargo xtask features` from the comm
 | Move Occurrence | `occurrence.move` | – |
 | Ground | `occurrence.ground` | – |
 
-## `parameters.*` (12)
+## `parameters.*` (13)
 
 | Command | Id | Toolbar |
 |---|---|---|
@@ -501,6 +502,7 @@ SolidCraft's commands by area, generated by `cargo xtask features` from the comm
 | Rename Parameter | `parameters.rename` | – |
 | Delete Parameter | `parameters.delete` | – |
 | Favourite Parameter | `parameters.favorite` | – |
+| Move Parameter | `parameters.move` | – |
 | Comment Parameter | `parameters.comment` | – |
 | Parameter Users | `parameters.users` | – |
 | Parameter Graph | `parameters.graph` | – |