Widget Loses Focus After Pressing F11 (fullscreen) - Not Sure Why?

I have a level select widget that works great, until I press F11 - to go full screen.

Once F11 is pressed, widget loses focus and I can’t seem to get it to regain focus.

In addition to this, all binded variables that show on the widget, disappear when F11 is pressed.

Not sure why this happens or what to do about it.

Also just wanted to mention that widget is set to focusable

Please help if you have any solutions - thanks