Finally, can someone link me the manual so I don't ask stupid questions?
I'd like that too! I've just been reading changelogs as they're posted and going through the settings menus - all of them. Each view has its own set of settings, and some settings are only available in some view menus but affect all views, for example.
Anyway, you can search or ask this community, or go to the Sync for Lemmy GitHub - that's an issue tracker, and I didn't see any readme.
I might be missing something, but those are the methods that I know of.