I found out that the level public variables are not accessible anywhere outside Blueprint.
My level uses some variables for me to adjust difficulty and for some basic settings. So i made these variables public hoping i could change them with ease directly from the editor (not in Blueprint), the same way i do with class Blueprints.
If i may suggest a simple solution, there could be a special entry in the scene outliner called “Level”. It would have a special status and be not renamable, not deletable etc… Selecting this entry would open its detail panel like it does for other actors and i would find my public variables there.