Try this:
Make sure if the “problematic” SketchUp window is the active. Then push:
⊞Win +Shift + ↑
(Windows Key + Shift + Up Arrow )
This will stretch a window to the top and bottom of the screen. Then you can catch the top bar and move, resize etc…
You can also try
⊞Win +Shift + ← or→
(Windows Key + Shift + left or right Arrow keys )
for moving SketchUp windows between multiple monitors