Hello @DR B
Typically, choosing your default monitor will move the task bar, but not always. This can happen if you have previously moved the task bar.
If you select a default monitor and your task bar doesn't move to the new default display, you can simply move your Windows taskbar by dragging back.
Just make sure your Windows taskbar isn't locked, then just grab and drag it to whatever monitor you want it to be on
or refer to this resolution:
The taskbar appears on the wrong monitor after you change the primary monitor in Windows 7
Best Regards
Karlie
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