Hi,
Thanks for the feedback. I think this is probably because your floors are of different size and scale to the maximum available page area. What you can do is take the biggest design, (or the design that scales the least on print) measure the maximum horizontal and vertical size of the plan, and draw some lines of the same size around the smaller plans. Use the 3rd icon in the construction menu to make the lines and if you don’t want to see them, make them white.

hope this helps,
Nico
Floorplanner Team