In Windows 11, the old Desktop toolbar from Windows 10 does not exist in the same way and custom taskbar toolbars were removed.
If the goal is to remove the Show desktop area on the far right of the taskbar:
- Right-click the taskbar.
- Select Taskbar settings.
- Expand Taskbar behaviors.
- Turn off Select the far corner of the taskbar to show the desktop.
If the item meant is the Task view button:
- Right-click the taskbar.
- Select Taskbar settings.
- Under Taskbar items, turn Task view to Off.