Editor stuck after open any game foundation edit window

I've not experienced that, but so sorry for your frustration!

I have had similar issues where Unity Editor gets into a bad state and this almost always fixes the problem:
1) close Unity (force close, restart if you have to).
2) restart PC (optional, but safer).
3) ensure you have sufficient disk space.
4) delete the Library folder at the root of your project.
5) start Unity--it should now startup correctly after a longer delay.

If the above steps do not work, here are some things to try:
1) revert any local changes--it's possible there's a bug in your code causing the Editor to crash.
2) create an empty project, add Game Foundation and ensure it's working. If it does, try adding changes from your crashing project until it breaks to see what's causing it.

Hope this helps. If you have any other issues, please don't hesitate to reach out. Best wishes!