Yep. This works. This is an undocumented console command that can’t be found anywhere other than the source code. I looked it up yesterday and found it in the source code together with a bunch of other undocumented commands: https://github.com/EpicGames/UnrealEngine/blob/40eea367040d50aadd9f030ed5909fc890c159c2/Engine/Source/Runtime/Engine/Private/UnrealEngine.cpp#L4956
But you don’t really need to do it, there is GameUserSettings->SetOverallScalabilityLevel and it’s available in blueprints, too. Which is doing just that.