Mission Control and App Exposé window controls
Dock Exposé adds a small control at the top-left of each exposed window thumbnail.
- Click the control to close the window.
- Hold Option and click to minimize the window instead.
- The glyph changes from an
×to a minus sign while Option is held. - Click a window title to focus and raise that window.
The feature can be disabled with Show window close buttons in Mission Control & App Exposé in Preferences.