Hey there @Strawboie! Welcome to the community! Clockwork got it right, it defaults to Epic for PC/Mac targets. Mobile is a bit different and usually defaults to low or medium in my experience. If you’d like to adjust the scalability in game you can use the Set Overall Scalability Level node, but it doesn’t work in editor, only in builds so hard to test it originally. I use this little BP in test scenes to see how it would look in the final between 0 (low) and 3 (epic).
Though as clockwork said, it’s always best to have a menu in a true final build. There’s also the benchmarking node but it’s sometimes inconsistent if run during a game.