Fix Guide: Stage Manager Windows Disappearing on macOS Tahoe 26.2

Symptom: When clicking an app in the Stage Manager strip, the window fails to come to the foreground, or the entire strip disappears from the left side of the screen.

Stage Manager in Tahoe 26.2 has a known conflict with external displays and "Displays have separate Spaces" settings.

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Fix 1: Reset Window Server Layout

The WindowServer process manages the visual position of windows. If it gets confused about the "Stage" coordinates, windows go off-screen.

1. Open Terminal.
2. Run:

sudo killall WindowServer

*Note: This will log you out of your Mac. Save all work first.*

Fix 2: Toggle "Separate Spaces" Setting

Stage Manager requires a specific handling of spaces to function across multiple monitors.

1. Go to System Settings > Desktop & Dock.
2. Scroll to the bottom and ensure "Displays have separate Spaces" is toggled ON.
3. If it was already on, toggle it off and on again to reset the preference.

Fix 3: Clear Stage Manager Preferences

Reset the underlying database that stores your app groupings.

1. Open Terminal.
2. Execute:

defaults delete com.apple.WindowManager

1. Restart Stage Manager via Control Center.

If you use a third-party window manager (like Rectangle or Magnet), try disabling it to see if it's conflicting with Stage Manager's native tiling.