The new version of pycharm 2023.3 uses the new UI by default. The interface suddenly changes a lot, and it feels very uncomfortable to use. . . . So, I searched online and found that there is indeed a way to return to the old version. I tried it and it was really nice~~~~
method:
Settings——>Appearance——>New_UI——>Enable New UI box is removed, just leave it unchecked. Restart PyCharm to return to the old version.
reference: