Baseboard Size

Hi and welcome to the forum!

To answer your question: You can’t. A baseboard is 720x720 meter and there is nothing you can change to that.

What you can do is add new baseboards to your route. To do so, go to the top left tab and find the add baseboard option (I think near the bottom; not near my game PC to check right now).
 
Surveyor
Open Topology Tab - the top one.
Click on the bottom Left Icon over - advanced which says Add / Update Ground,
Click on the side of the board in the direction you want to extend in.
 
Here it is in pictures

Topology 01.jpg
 
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