One of the hardest UI things I tend to encounter is fitting a tall narrow rectangle with a short wide one. (In my current situation each rectangle is a sheet of controls.) It seems to be impossible to arrange it in such a way that looks nice and doesn't waste space. The only thing I can ever think of doing is floating them in their own windows. Currently I'm trying to put each one in its own tab control page, which helps a little since now they can overlap, but there's still a big empty space on at least one of the pages.
Is there a way to arrange them nicely? Is this a common problem with a common solution? If possible I'd like to avoid resizing them or separating them, but somehow I don't see avoiding that being possible.