No, there isn't, sadly. Given what's going on there - any new tables MUST be on the diagram - I don't see much hope of a great improvement. If you generate the model from a complex db with e.g. 50 tables, dropping them all into the same corner is not going to help.
However, what you can do to find the new table(s) is this: click on the icon at the bottom right and hold the mouse down:
you will get a thumbnail of where all the tables are, and can move the mouse (still held down) over it and the main window will follow the area you are dragging over. Release the mouse button when you've found the one right at the bottom, and move it:
It doesn't fix it, but it makes it a bit easier.