Hi Anon,
What you are experiencing is related to how Windows 11 differentiates between left and right Alt keys combined with the Alt+Tab interface and keyboard input handling. Normally, pressing Alt+Tab brings up a full window switcher showing all open apps, but in some cases, the system may only switch to the last used window if the left Alt key is not being recognized properly or if certain keyboard settings are interfering. The fact that the right Alt key partially works confirms that the issue is keyboard-specific rather than a global system problem.
To restore the normal all-window view, you can try several approaches. First, check your keyboard layout in Settings → Time & Language → Typing → Advanced keyboard settings to ensure it matches your physical keyboard. Second, confirm that sticky keys, filter keys, and other accessibility features are off, as these can alter Alt+Tab behavior. Third, try reinstalling or updating your keyboard driver via Device Manager, and if you are using a laptop with function key combinations, make sure no Fn lock or key remapping software is active. Additionally, some users have resolved similar issues by running Windows Terminal as administrator and executing sfc /scannow to repair system files that control window switching.
If none of these steps help, testing with an external keyboard can determine whether the left Alt key itself is malfunctioning. In most cases, the all-window Alt+Tab functionality returns once the system correctly recognizes the left Alt input or after updating the keyboard driver.