Hello!
I'm Yasllame. I'm here to help and clarify.
This functionality doesn't exist in Windows 11 in the same way it did in Windows 10.
What you describe in Windows 10 isn't a standard system feature, but rather a taskbar toolbar called "Desktop," which could be added manually. This feature was removed in Windows 11.
Why doesn't this exist anymore in Windows 11?
In Windows 11, Microsoft:
removed custom toolbars from the taskbar;
simplified the taskbar, eliminating items such as:
Desktop (toolbar),
Links,
Address bar,
custom toolbars in general.
This is a design decision, not a hidden setting.
What still exists in Windows 11 (official alternatives)
Show Desktop
Click on the right corner of the taskbar (thin line).
Or use the shortcut: Win + D
File Explorer
Open Explorer → Desktop
Allows access to all items, but not as a quick panel.
Unofficial alternatives (optional)
If you really need this behavior:
Third-party tools like ExplorerPatcher or StartAllBack can:
restore Windows 10 behavior,
reactivate toolbars in the taskbar.
Important: these solutions are not from Microsoft and are not officially supported.
I hope this information has been helpful! If you need anything else, I'm here.
Sincerely,