Maybe if you support mods, have a button ‘Mods’ or ‘Workshop’.
And when you click on it, you get a list of the installed mods and a button for each mod to alter their settings.
And on the top a button that opens the workshop through steam overlay.
I think both could be good. In the game is the most important. However if there’s a problem with even loading savegames or just in the options, it would be helpful for players to report it from the menu.