LRClassic won't show photo in full screen

1. Version: LRClassic 14.1.1

2. macOS Sequoia 15.2 

3. When I try to view a photo in full screen in the library module of LRClassic, I just get a black screen. 

4. Expected result is that my photo would be enlarged to full screen, but the actual result is that I just get a black screen.