In Cursor's agent mode, I can't see the red and green blocks for code insertions and deletions, nor do the "Keep all" or "Accept all" buttons appear. What's going on?

In Cursor’s agent mode, I can’t see the red and green blocks for code insertions and deletions, nor do the “Keep all” or “Accept all” buttons appear. What’s going on?

Thank you so much for your help. I’ve fixed the problem.