I've used the Web Site Map tool to create a map of our website. It's quite large so I need to edit the map a bit.

I've increased the font size but I am having trouble adjusting the size of the boxes. I don't seem to be able to just widen them, either by clicking and dragging or changing the number in the 'Size and position' box - it just snaps back to the previous number.

I need to be able to amend multiple shapes at the same time. Anyone got any advice?