Hi, I would like to use another sheet size in the paper space views. From the size it looks like the standard  view sheets 1 and 2 are A3 in landscape. How do i change these sheet sizes?

(I do not mean the printing paper size but the white rectangle that shows in the paper space sheets.)

Also related it think; What does the dashes rectange represent on the paper view, and where can i set it´s size.

I tried setting drawingbounds, but that does not change the size of the represented paper or the dashed line. Also if a change the viewport size the dashed line stay´s in place.