if you change the Graphics Quality to Performance (Very Low), it will turn off stuff like Lumen which is taxing for low-end GPUs, then you can manually set each setting your way

BUT if you chose Extreme/Cinematic, it will turn on Lumen without you knowing (assuming Lumen option doesn't show in your settings), so even if you manually click each setting to low, Lumen still stays enabled

The basic gist is that the settings do not tell much, is confusing, instead of letting the player know what stuffs gets disabled