So after installing everything as requested in the official setup guide (only allowed mods rsg) and by removing mods that only crash i now have the following mod list with the legacy fabric loader multimc instance:

Anchiale, Atum, Legacy Crash Fix, SpeedrunIGT, StandardSettings, State Output, Tab Focus, WorldPreview

I can't find the standardsettings button as in 1.16 and i can't find any tutorial on how to set it up correctly. Also i don't know how to configure wall.

Thanks in advance.