diff --git a/crates/ui-egui/src/extra_windows.rs b/crates/ui-egui/src/extra_windows.rs
index 71e63fa..e269573 100644
--- a/crates/ui-egui/src/extra_windows.rs
+++ b/crates/ui-egui/src/extra_windows.rs
@@ -52,15 +52,16 @@ pub fn run(app: &mut SoundApp, id: &str, p: &Value) -> Option<Value> {
 }
 
 pub fn show(app: &mut SoundApp, ctx: &egui::Context) {
-    apply_customization(app, ctx);
     auto_update(app, ctx);
     renderer(app, ctx);
     ui_customization(app, ctx);
+    apply_customization(app, ctx);
 }
 
 fn apply_customization(app: &mut SoundApp, ctx: &egui::Context) {
     let want = (app.extra.ui_scale.clamp(0.75, 1.5), app.extra.reduce_motion);
-    if app.extra.applied == Some(want) {
+    // Rescaling mid-drag would move the Interface scale slider out from under the pointer.
+    if app.extra.applied == Some(want) || ctx.input(|i| i.pointer.any_down()) {
         return;
     }
     // Only touch the zoom once the user has changed it, so platform scaling stays untouched.
diff --git a/crates/ui-egui/src/shortcuts.rs b/crates/ui-egui/src/shortcuts.rs
index 90a4e08..fb978c3 100644
--- a/crates/ui-egui/src/shortcuts.rs
+++ b/crates/ui-egui/src/shortcuts.rs
@@ -55,6 +55,8 @@ fn search_chord(m: Modifiers, mac: bool) -> bool {
 }
 
 pub fn handle(app: &mut SoundApp, ctx: &egui::Context) {
+    // Cmd+= and Cmd+0 are Mix/Edit and Quantize to Grid, not egui's built-in interface zoom.
+    ctx.options_mut(|o| o.zoom_with_keyboard = false);
     if ctx.egui_wants_keyboard_input() || app.dialogs.open.is_some() {
         return;
     }
diff --git a/crates/ui-egui/tests/appearance.rs b/crates/ui-egui/tests/appearance.rs
new file mode 100644
index 0000000..87145a8
--- /dev/null
+++ b/crates/ui-egui/tests/appearance.rs
@@ -0,0 +1,47 @@
+use egui::accesskit::Role;
+use egui::{Event, Modifiers, PointerButton, Pos2, Vec2, pos2, vec2};
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+use soundcraft_ui_egui::{Services, SoundApp};
+
+const WINDOW_PX: Vec2 = vec2(1600.0, 1000.0);
+
+fn frame(h: &mut Harness<'_, SoundApp>, px: Pos2, pressed: Option<bool>) {
+    let zoom = h.ctx.zoom_factor();
+    h.set_size(WINDOW_PX / zoom);
+    let pos = (px.to_vec2() / zoom).to_pos2();
+    h.input_mut().events.push(Event::PointerMoved(pos));
+    if let Some(pressed) = pressed {
+        h.input_mut().events.push(Event::PointerButton { pos, button: PointerButton::Primary, pressed, modifiers: Modifiers::NONE });
+    }
+    h.step();
+}
+
+#[test]
+fn interface_scale_slider_follows_the_pointer() {
+    let mut app = SoundApp::new(soundcraft_engine::demo::demo_engine(), None, Services::default());
+    app.extra.show_ui_customization = true;
+    let mut h = Harness::builder().with_size(WINDOW_PX).with_pixels_per_point(1.0).build_ui_state(
+        |ui, app: &mut SoundApp| {
+            let ctx = ui.ctx().clone();
+            app.logic(&ctx);
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(6);
+    let rail = h.get_by_role(Role::Slider).rect();
+    let start = pos2(rail.left() + rail.width() / 3.0, rail.center().y);
+    let end = pos2(rail.right() + 40.0, rail.center().y);
+    frame(&mut h, start, Some(true));
+    let mut scales = vec![];
+    for i in 1..=20 {
+        frame(&mut h, start.lerp(end, i as f32 / 20.0), None);
+        scales.push(h.state().extra.ui_scale);
+    }
+    assert!(scales.windows(2).all(|w| w[0] <= w[1]), "{scales:?}");
+    frame(&mut h, end, Some(false));
+    frame(&mut h, end, None);
+    assert_eq!(h.state().extra.ui_scale, 1.5);
+    assert_eq!(h.ctx.zoom_factor(), 1.5);
+}
diff --git a/crates/ui-egui/tests/shortcuts.rs b/crates/ui-egui/tests/shortcuts.rs
index fc7fdc4..5d04d47 100644
--- a/crates/ui-egui/tests/shortcuts.rs
+++ b/crates/ui-egui/tests/shortcuts.rs
@@ -1,7 +1,7 @@
 use egui::os::OperatingSystem;
 use egui::{Key, Modifiers};
 use serde_json::json;
-use soundcraft_ui_egui::{Services, SoundApp, shortcuts};
+use soundcraft_ui_egui::{MainWindow, Services, SoundApp, shortcuts};
 
 fn press(ctx: &egui::Context, app: &mut SoundApp, key: Key, modifiers: Modifiers) {
     let events = [true, false].map(|pressed| egui::Event::Key { key, physical_key: None, pressed, repeat: false, modifiers }).to_vec();
@@ -24,3 +24,23 @@ fn ctrl_shift_arrows_nudge_the_selected_clip_gain() {
         assert_eq!(app.engine.session().find_clip(kick).unwrap().1.gain_db, 1.0, "{os:?}");
     }
 }
+
+#[test]
+fn cmd_equals_toggles_mix_and_edit_without_zooming() {
+    let mac_cmd = Modifiers { mac_cmd: true, command: true, ..Modifiers::NONE };
+    let pc_ctrl = Modifiers { ctrl: true, command: true, ..Modifiers::NONE };
+    for (os, cmd) in [(OperatingSystem::Mac, mac_cmd), (OperatingSystem::Windows, pc_ctrl), (OperatingSystem::Nix, pc_ctrl)] {
+        let mut app = SoundApp::new(soundcraft_engine::demo::demo_engine(), None, Services::default());
+        let ctx = egui::Context::default();
+        ctx.set_os(os);
+        ctx.set_zoom_factor(1.25);
+        press(&ctx, &mut app, Key::Equals, cmd);
+        assert_eq!(app.ui.window, MainWindow::Mix, "{os:?}");
+        press(&ctx, &mut app, Key::Equals, cmd);
+        press(&ctx, &mut app, Key::Num0, cmd);
+        press(&ctx, &mut app, Key::Minus, cmd);
+        ctx.run_ui(egui::RawInput::default(), |_| {}).textures_delta.clear();
+        assert_eq!(app.ui.window, MainWindow::Edit, "{os:?}");
+        assert_eq!(ctx.zoom_factor(), 1.25, "{os:?}");
+    }
+}