The CE board is already created, but I'm looking for the option to add them to the "leaderboards" scrolling menu of the main game, as I've seen in other games. Maybe I'm blind but it's nowhere to be found in the Edit Game options. Thanks for your help (this should be a quick thread)

I think that’s something you need site staff to do.

The category extension need to have the catagory extension game type and the base game set as the main game. To get this changed you need to submit a support hub request

Alright thanks, I'll look into that!