Prevents users from moving taskbar to another screen dock location. If you enable this policy setting the user will not be ...

Prevents users from moving taskbar to another screen dock location.

If you enable this policy setting the user will not be able to drag their taskbar to another side of the monitor(s).

If you disable or do not configure this policy setting the user may be able to drag their taskbar to other sides of the monitor unless disallowed by another policy setting.