About issue (1), go to the MapViewComponent you gave your character and uncheck Inherit Yaw. It won’t spin the minimap then. Is that what you were looking for?
As for (2), it could be the sky. Go to the MapBackground actor and in the Hidden Actors list, add the sky actor. Use the actor picker and click the sky’s sprite handle in the viewport. Or add the sky’s blueprint class to Hidden Actor Classes. Hope that solves it. 
If not please post a screenshot of the red you’re seeing.