Eclipse Editor Screen Does Not Display File Names on Tabs

I'm using Eclipse's Oxygen.

Normally, when I create a new class or open the source code, I think the file name will be displayed on the tab? at the top of the editor, but the file name will no longer be displayed after changing the appearance.

How can I restore it?

By the way, you can't change it to the previous appearance.You can only "close" by right-clicking.