diff --git a/crates/gpui/src/platform.rs b/crates/gpui/src/platform.rs
index f2190f8a40..8fb2e2254b 100644
--- a/crates/gpui/src/platform.rs
+++ b/crates/gpui/src/platform.rs
@@ -1495,7 +1495,12 @@ pub struct WindowOptions {
     /// The kind of window to create
     pub kind: WindowKind,
 
-    /// Whether the window should be movable by the user
+    /// Whether the window should be movable by the user.
+    ///
+    /// On macOS 27, custom titlebar windows that implement their own drag behavior
+    /// with [`Window::start_window_move`] should set this to `false`; otherwise
+    /// AppKit can treat the titlebar region as system-owned and delay clicks
+    /// while disambiguating titlebar double-clicks.
     pub is_movable: bool,
 
     /// Whether the window should be resizable by the user
diff --git a/crates/zed/src/zed.rs b/crates/zed/src/zed.rs
index 9aef010325..3709a6c4b4 100644
--- a/crates/zed/src/zed.rs
+++ b/crates/zed/src/zed.rs
@@ -377,7 +377,8 @@ pub fn build_window_options(display_uuid: Option<Uuid>, cx: &mut App) -> WindowO
         focus: false,
         show: false,
         kind: WindowKind::Normal,
-        is_movable: true,
+        // Zed handles window movement itself, so disable AppKit's titlebar dragging.
+        is_movable: false,
         display_id: display.map(|display| display.id()),
         window_background: cx.theme().window_background_appearance(),
         app_id: Some(app_id.to_owned()),