Phpstorm why doesn't switch development language?

Question

phpstorm

Hello, I have a problem recently. I went into the project, opened the file, and the editor politely offered to change the development language to React JSX.

I, of course, accepted this invitation. The editor thought, started indexing the files, and after... And after that, nothing. Generally.
Those. He allegedly changed the language, but he did not change either. And I don't know what to do next. I even reinstalled this editor, didn't help.

Answer 1

The problem was that earlier I opened another directory as a project, and the .idea folder was created in it.
It had to be deleted.