Sorry, but I have no clue where this "Main Game Default" should be - pls explain in more detail.
First: it's about GM, not DHH
Every time, you enter a
'scene' (maker, title, lobby, room,...), the game loads it's default setting (Main Game, Title, Studio, VR). If your setting there is safed without SSS, it will allways load that way.
So,...
even if you are in the lobby and enable SSS:
it will be disabled, when you enter the next room:
You need to enable SSS, and
'Save Current as Main Game DEFAULT':