The way I explain it is you know how when your computer illiterate parents ask you to do some simple task that you have literally no idea how to do, but you look at some menus that have vaguely similar sounding titles based on your years of building up intuitions about how computer UIs work, click those menus, find what you need and do the task? GitLab breaks all those intuitions so easy tasks become hard.
YMMV, of course.
I've been using Sourceforge recently and am pretty happy with it overall, though it's still very alpha quality.
Will it be at the top? Down the side? Tab based? Drop downs? Who knows!?
Meanwhile, Github's UI is so stable (outside of the super infrequent redesigns) you basically develop a muscle memory for it.
Honestly I'm not sure how you could even be confused by it as an individual developer either. I used it for my individual projects before getting a real development job and didn't have any issues. It different to github but not worse or less correct. Its just github has become the standard on what the default layout and names should be.
You can find it in the project settings in the "sharing and permissions" section: https://docs.gitlab.com/ee/user/project/settings/#sharing-an... You can also disable the repository feature, and use the project for issue management only.
IIRC, you must be owner of the project.