I downloaded a repository as a zip file from GitHub and I want to open it in PyCharm, which I installed specifically for this task. My problem is that when I open the folder in PyCharm, the files disappear from the left menu after a few seconds.
It is not a repo I am supposed to modify and then push or something my task is just to run tests for coverage.

I tried uninstalling and reinstalling PyCharm, deleting et redownloading the repo, deleting the .idea folder, invalidating caches in PyCharm but none of this works.
Can someone please help me with this issue ?

You can find a picture of what PyCharm looks like after the files disappear.