However, if you want to unpin all taskbar icons at once in Windows 11 or Windows 10, here is how you can do that. For that, you do not need to use third-party apps since a simple .bat file can do ...

Select All: The square with the square-ish arrangement of dots around it (far left icon), is your Select All button. Why on Earth that symbolizes selecting all is beyond me, but that’s what it is.