I think this is due to the engine/plugin I use :/ I have the same issue with my main project (using the same engine/plugin versions) where some Mac users have a lot of issues.
One thing that has helped some Mac users with my other game is allowing the game to both read/write files on your computer, so you could try that! It sounds like you might have the same issue they have, where you can't change the settings, make saves or see/unlock CGs because the game isn't allowed to write files, which those actions need to do. You just need to right-click the game's exe, check its properties, go into permissions and see if it's allowed to Write. If it isn't, giving that permission might fix your issues!