Is there a posibility to align the edges of an polygon (in my case these edges are also the total extents of the layer) to the edges of the map item? I want to keep the specific page dimensions.
edit: I was trying around a while and found a kind of solution: there is an command called Export map as PDF in the "Project" Menu tab. There you can set the extent from a layer of your choice. This exported all active layers in my main canvas to the given extent. Not exactly what I was looking for but in this case it worked fine for me.