If you ever happen to open a window, and it is oversized so, the Title bar of the window itself is not reachable, you will not be able to pick it with the mouse and move it, so one way that works on KDE, GNOME, Fluxbox and others is:

Moving a window with the help of the keyboard

First you need to press the ALT key, then click the left button of the mouse while you have the mouse over the window, now you can move it.

If you use the right button, you will be able to resize it, (while pressing ALT key too)