To: noobigy
Dear user,
Sorry for the delay in reply.
You can change the size and position of the mask by dragging the back squares at the corners of the mask - see the screenshot attached.
Put the mouse on one of the squares - you will see a point finger - click on it and without releasing the mouse set the mask position.
When you place the mouse coursor in the middle of the mask and see arrows with different directions - you can move the whole mask.
Please let me know if I can be of any further assistance to you.
Kind regards