One question...

Theme: PCB outline, shape of the board, copper layers, layers

How can I enlarge a board from 2 x 4" mm to 4 x 4"?
If you have used the PCB Outline Wizard to define the shape of the board, you can of course use it again. It can be found in the "Actions" menu under "Automatic and Wizards". The existing outline is then replaced.

Basically, the outline of the board is nothing more than 4 lines on layer "23=Board outline", so you can also simply drag&drop one side of this rectangle (M1H). Please do not hit the small black box in the middle, but only the line itself.