Edit - Figured it out, must have accidently added an additional canvas that was messing things up.
So far my game is just a series of screens with buttons. I had no issue previously clicking on buttons or input boxes, tabs etc. But all of a sudden I can’t click on anything. Buttons, tabs, input boxes, it’s all frozen. When I select a button for example I check that it’s interactable, and it is. But I can’t click on it when the game is running. The only recent change I can think of, is that I changed the Canvas, which contains all my screens, to be Screen Space - Overlay, rather than “World Space” But when I set it back to world space nothing changes, can’t click on anything. I also changed UI Scale Mode to Scale with Screen Size. Again, reverting these changes doesn’t seem to help with the frozen screen issues.
Any ideas?