Hello,
Sorry to hear you are having issues. This is what I get when I right click on my taskbar.

Perhaps, Start11 was not properly installed. Please try, uninstall Start11, reboot immediately (important), download latest version available in your account product download page. https://store.stardock.com/myaccount/products. Install it, reboot immediately again. Retest it and report back.
If the issue still appear. We need to know your Windows 11 full version and OS Build number. Please use Winver.exe to get these numbers.
Thank you,
Basj,
Stardock Community Assistant.