If "Auto-hide" is enabled, the XCenter is automatically reduced in size after the mouse pointer leaves it. It is then reduced to a tiny bar at the edge of the screen and will re-appear if you move the mouse pointer over it.

If "Auto-hide" is enabled, the slider below the checkbox allows you to set the exact delay after which the XCenter will be hidden. This is specified in seconds and can be in a range from 1 to 60.

"Auto-hide" cannot be used together with "Reduce desktop workarea".