You can affect the scale of gravity. In your world settings for a level you can enable global gravity and make all objects fall faster or slower or even make them fly up.
Here’s a video of how to do the world settings gravity thing:
You can play a little with individual actors and how much they are affected by gravity.That’s all you’ll be able to do via blueprint though. If you want gravity to work in all directions you’ll have to dive into C++ and engine source code.
Cheers