Regedit Solution that works for both Open-Shell and T-Clock (w/o 3rd party app).

Tom's Hardware: "How to Replace the Start Menu in Windows 11" (and so, T-Clock)

Way down on article, look for "Enabling Classic Taskbar".

Open-Shell works! And so T-Clock.... although, T-Clock still showing in 2 lines (if someone can figure out how to make 1 single line, please reply).

Xant