Cannot move windows to second screen

I have an external monitor plugged into my notebook, but I cannot move windows from the bottom screen (built-in screen) to the upper screen (external monitor).

The windows stick at the top border (below the panel) of the built-in screen, while the mouse moves into the second screen.

I think, it's because of the top panel; It works if I place the external monitor below the built-in screen.

How can I solve this issue? Or move windows directly without using drag and drop.

Solution:

Go to Settings->Display.

Turn Off Sticky edges.

Solved the problem for me.

Alt + left-click anywhere in the window (E.G. the bottom) and then move it...