on linux, you can hold the "alt" key, and drag with the right mouse button to resize a window from any corner
or hold the "alt" key and the left mouse button, to drag a window from any place (not just the titlebar), so you can actually move a window's titlebar outside the screen
all these gestures can be done "cliking" in ANY area of the window, over buttons or comboboxes
your Window manager will inercept it and move the window