Hello
This could be due to a variety of reasons such as misconfigured taskbar settings, malfunctioning system services, outdated system, faulty updates, or corrupt system files. Here are some potential solutions that might help:
Restart Taskbar Services: Press CTRL + Shift + Esc to launch the Task Manager and switch to the Details tab. Locate explorer.exe, select it, press End Task, and check if the taskbar works after the explorer service restarts.
Modify Taskbar Settings: Press Win + I and navigate to Personalization > Taskbar. Modify the settings under Taskbar behaviors.
Update / Rollback System: Issues like this are often caused by minor bugs which are patched in new updates. If you haven’t updated your system in a while, this is likely to be helpful.
Repair System Files: You can use a PowerShell cmdlet to reinstall and re-register all the built-in apps.