diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index 8d71e64d..4c01c496 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -78,6 +78,8 @@ pub enum Kind {
     Sweep {
         operation: usize,
     },
+    /// Application preferences (applied as they change; kept between runs).
+    Preferences,
     /// Physical material (and with it the appearance) of bodies.
     Material {
         index: usize,
@@ -286,6 +288,10 @@ impl Dialog {
         Some(d)
     }
 
+    pub fn preferences() -> Dialog {
+        Dialog::new(Kind::Preferences, vec![])
+    }
+
     pub fn rename(feature: u64, name: &str) -> Dialog {
         Dialog::new(Kind::Rename { feature, name: name.to_string() }, vec![])
     }
@@ -495,6 +501,7 @@ fn title(k: &Kind) -> &'static str {
         Kind::Mirror => "MIRROR",
         Kind::Measure { .. } => "MEASURE",
         Kind::Material { .. } => "PHYSICAL MATERIAL",
+        Kind::Preferences => "PREFERENCES",
         Kind::Section { .. } => "SECTION ANALYSIS",
         Kind::PatternRect { .. } => "RECTANGULAR PATTERN",
         Kind::PatternCirc { .. } => "CIRCULAR PATTERN",
@@ -592,6 +599,30 @@ fn update_measure(app: &SolveApp, d: &mut Dialog) {
     }
 }
 
+/// The preferences, applied as they change.
+fn preferences_rows(app: &mut SolveApp, ui: &mut egui::Ui) {
+    ui.label("Theme");
+    let mut theme = usize::from(!app.ui.dark);
+    combo(ui, "pref_theme", &["Dark", "Light"], &mut theme);
+    app.ui.dark = theme == 0;
+    ui.end_row();
+    ui.label("Grid");
+    ui.checkbox(&mut app.ui.show_grid, "");
+    ui.end_row();
+    ui.label("Perspective view");
+    ui.checkbox(&mut app.ui.perspective, "");
+    ui.end_row();
+    ui.label("Project face edges into new sketches");
+    let mut auto = app.session.auto_project;
+    if ui.checkbox(&mut auto, "").changed() {
+        let _ = app.run("sketch.auto_project", json!({ "value": auto }));
+    }
+    ui.end_row();
+    ui.label("Click selects whole bodies");
+    ui.checkbox(&mut app.ui.pick_bodies, "");
+    ui.end_row();
+}
+
 fn fmt_mm(v: &Value) -> String {
     v.as_f64().map(|x| format!("{x:.3} mm")).unwrap_or_default()
 }
@@ -755,6 +786,7 @@ pub fn show(app: &mut SolveApp, ctx: &egui::Context) {
                     }
                     Kind::Mirror => {}
                     Kind::Measure { result, .. } => measure_rows(ui, result.as_ref()),
+                    Kind::Preferences => preferences_rows(app, ui),
                     Kind::Material { index } => {
                         let names: Vec<&str> = solvecraft_engine::doc::MATERIALS.iter().map(|(n, _)| *n).collect();
                         ui.label("Material");
@@ -888,7 +920,7 @@ pub fn show(app: &mut SolveApp, ctx: &egui::Context) {
             });
             ui.add_space(6.0);
             ui.horizontal(|ui| {
-                if !matches!(d.kind, Kind::Sketch | Kind::Params { .. } | Kind::Measure { .. })
+                if !matches!(d.kind, Kind::Sketch | Kind::Params { .. } | Kind::Measure { .. } | Kind::Preferences)
                     && ui
                         .add(
                             egui::Button::new(
@@ -901,7 +933,7 @@ pub fn show(app: &mut SolveApp, ctx: &egui::Context) {
                 {
                     ok = true;
                 }
-                let close = if matches!(d.kind, Kind::Params { .. } | Kind::Measure { .. }) { "Close" } else { "Cancel" };
+                let close = if matches!(d.kind, Kind::Params { .. } | Kind::Measure { .. } | Kind::Preferences) { "Close" } else { "Cancel" };
                 if ui.add(egui::Button::new(close).min_size(vec2(70.0, 24.0))).clicked() {
                     cancel = true;
                 }
@@ -914,7 +946,7 @@ pub fn show(app: &mut SolveApp, ctx: &egui::Context) {
     let (enter_free, esc) = ctx.input(|i| (i.key_pressed(egui::Key::Enter), i.key_pressed(egui::Key::Escape)));
     let nothing_focused = ctx.memory(|m| m.focused().is_none());
     let canvas_enter = enter_free && ctx.memory(|m| m.had_focus_last_frame(egui::Id::new("sc_canvas_value")));
-    let enter_applies = !matches!(d.kind, Kind::Sketch | Kind::Params { .. } | Kind::Measure { .. } | Kind::ConfirmDelete { .. });
+    let enter_applies = !matches!(d.kind, Kind::Sketch | Kind::Params { .. } | Kind::Measure { .. } | Kind::ConfirmDelete { .. } | Kind::Preferences);
     if enter_applies && (enter || canvas_enter || (enter_free && nothing_focused)) {
         ok = true;
     }
@@ -1300,7 +1332,7 @@ fn dialog_commands(app: &SolveApp, d: &Dialog) -> Result<Vec<(String, Value)>, S
         Kind::EditParam { name, expr } => ("ChangeParameterCommand", json!({"name": name, "expression": expr})),
         Kind::Rename { feature, name } => ("FusionRenameTimelineEntryCommand", json!({"feature": feature, "name": name})),
         Kind::ConfirmDelete { feature, .. } => ("FusionDeleteCommand", json!({ "features": [feature.to_string()] })),
-        Kind::Sketch | Kind::Params { .. } | Kind::Measure { .. } => return Ok(Vec::new()),
+        Kind::Sketch | Kind::Params { .. } | Kind::Measure { .. } | Kind::Preferences => return Ok(Vec::new()),
     };
     let mut params = params;
     if let Value::Object(m) = &mut params {
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index f127d9f7..a45f5b12 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -159,16 +159,35 @@ impl SolveApp {
 
     /// Preferences kept between runs (JSON), for the host to store.
     pub fn prefs(&self) -> String {
-        json!({ "dark": self.ui.dark }).to_string()
+        json!({
+            "dark": self.ui.dark,
+            "grid": self.ui.show_grid,
+            "perspective": self.ui.perspective,
+            "pick_bodies": self.ui.pick_bodies,
+            "auto_project": self.session.auto_project,
+        })
+        .to_string()
     }
 
     /// Restore preferences saved with [`SolveApp::prefs`].
     pub fn load_prefs(&mut self, prefs: &str) {
-        if let Ok(v) = serde_json::from_str::<Value>(prefs)
-            && let Some(d) = v.get("dark").and_then(Value::as_bool)
-        {
+        let Ok(v) = serde_json::from_str::<Value>(prefs) else { return };
+        let flag = |k: &str| v.get(k).and_then(Value::as_bool);
+        if let Some(d) = flag("dark") {
             self.ui.dark = d;
         }
+        if let Some(g) = flag("grid") {
+            self.ui.show_grid = g;
+        }
+        if let Some(p) = flag("perspective") {
+            self.ui.perspective = p;
+        }
+        if let Some(b) = flag("pick_bodies") {
+            self.ui.pick_bodies = b;
+        }
+        if let Some(a) = flag("auto_project") {
+            self.session.auto_project = a;
+        }
     }
 
     pub fn with_control(mut self, rx: Receiver<ControlRequest>) -> Self {
diff --git a/crates/ui-egui/src/toolbar.rs b/crates/ui-egui/src/toolbar.rs
index 22e4acfd..9af765f0 100644
--- a/crates/ui-egui/src/toolbar.rs
+++ b/crates/ui-egui/src/toolbar.rs
@@ -159,6 +159,10 @@ fn file_menu(app: &mut SolveApp, ctx: &egui::Context) {
                 close = true;
             }
             ui.separator();
+            if item(ui, "Preferences…", "") {
+                app.dialog = Some(crate::dialogs::Dialog::preferences());
+                close = true;
+            }
             if item(ui, "Quit", "") {
                 app.quit_requested = true;
                 close = true;