I just wanted to add that over 2.5 years later (4.27) this didn’t work. It’s true that this is how you set the default fonts supposedly. However, like many other defaults, one would expect this to show the yellow “right->up-> left” arrow to reset to the expected default. Maybe I need to restart; but no other setting I’ve modified lately required this and after adjusting I don’t have this option (it is still Roboto); even after importing Lato & Playfair Display for various items in the above screenshot. Further still, new text related UMG elements still resulted in Roboto. I’d like someone more experienced to weigh in on how I’m using this property wrong!