If an application stops responding, you can use several methods to force quit on Windows 11 (https://notchox.com/resources/how-to-force-quit-on-windows/). One of the easiest ways to do this is by pressing the keys Ctrl+Shift+Esc to access the Task Manager program. Locate the application that is unresponsive in the Processes tab of the Task Manager, then right-click it and choose to End Task. Another shortcut that works well is Alt+F4 if the frozen application is the one currently selected. However, in cases where these keyboard shortcuts do not work, you may choose to restart your computer.