Although Windows 11 shows icons in an Overflow menu on the Taskbar, it is possible to stack or unstack icons on the Taskbar using this tutorial. You can do that with the help of the Registry Editor.

Add the TaskbarSi value to the Windows Registry. Change value data to 0 for a small taskbar or 2 for bigger icons. Restart or log out for it to take effect. The easiest way to change the Windows 11 ...

Click the Taskbar page on the right side. (Option 1) Select the "Always" option in the "Show smaller taskbar buttons" setting to show smaller icons. (Option 2) Select the "When taskbar is full" option ...

If you want to show the Pen menu Taskbar icon on Windows 11, here is how you can do that using Windows Settings. You can open various apps from this menu, such as Sticky Notes, Snip & Sketch, etc.