I would prefer doing this by BP but if I can only do it via C++ that is fine. I simply can’t find a way to change any of the world settings in BP because I can’t get a reference to the world settings.
How do you get a reference to the WorldSettings class in a BP or C++ (or both 
)?
Edit: Nevermind I figured it out.
Please share how you figured it out, looking to get reference to WorldSettings in c++ as well so i can manipulate gravity Z
In C++ you can use UWorld::GetWorldSettings or AActor::GetWorldSettings. Neither is directly exposed to Blueprint though as far as I can tell. However in Blueprint you should still be able to get the WorldSettings actor by using a “Get All Actors Of Class” node. Note that these types of nodes may have a performance impact if you run them too frequently (for example in tick). You should therefore probably do that once and store the result for use later on.
You know, people like you make this world a pretty bad place to live sometimes.
The default WorldSetting variables are ReadOnly so Blueprint can’t change it but C++ can.