I’ve recently renamed my games “map”, and since then every time I open my project, an “untitled” map is open, and I have to do file -> open level to get the right level. How do I open my level by default without doing it manually?
You have to reselect them in the editor preferences… 
Where at specifically? I am having a hard time finding it.
Yep. I meant the project settings… :o
There, under “Maps & Modes”, you should see it 
Nevermind, I got it. It was in project settings rather than editor prefrences.