I´m using QGIS Lyon 2.12 and am trying to make a map in the print composer with the scale 1:25000 in A4 size. I have drawn the map layer, but the map only covers a small part of the A4 space in the correct scale. I´d like to resize the layer in print composer so that it covers more space, while retaining scale and aspect ratio. Is there a way to do this?
If not, is it possible to crop the page while keeping A4 proportions? Basically, cut away all the white areas.