Click on the window in your toolbar to 'select' it

Windows right cursor (number of screens you ever have + 1)

Windows left cursor (number of screens you ever have + 1)

Windows shift right (number of screens you ever have)

Windows shift left (number of screens you ever have)

ALt+Space to pull up this menu

then the m key, then cursor keys to move it around. This is especially useful if it is 'hidden' by having only 1 row of pixels on the screen - far left/right, so you don't 'see' it on the screen even though it is only 'mostly' off the screen