How do I resize all layers simultaneously in LayOut?

My floor plans have a lot of layers. How do I copy all entities and layers to a different paper size? I want to resize my floorplan so the dimensions can be read more easily when printed. How can I do that without ruining everything?

Thank you so much in advance!

This is currently not supported. You have to size the paper, scale all content and change the viewport scales all separately. You could perhaps change a scale factor in the printer dialog, but that is a bit of a workaround.