It is possible to move, copy/cut, delete and set the background colour, line colour, line option and shape of several boxes simultaneously. Highlight the boxes and select the action.
Highlight
The boxes can be highlighted in two ways:
1. Click a box to highlight it, hold down the control key (Ctrl) and click the rest of the boxes to be highlighted.
2. Left-click in an empty place directly at the corner of one of the boxes, hold down the mouse button and drag the mouse over the boxes to be highlighted.
Select action
When the boxes are highlighted, you can delete the boxes or edit the shape of the boxes by clicking the 
icons. You can also copy and cut multiple boxes simultaneously.
To move multiple boxes simultaneously, left-click on one of the highlighted boxes, hold down the mouse button and drag them to where they should be.
Info: If you move multiple boxes simultaneously, they move relative to their current positions.