@katinkamom Are you sure you're working with the correct Sims 4 folder? The fact that you deleted the entire folder but still saw your Library content, if that's the sequence of events (i.e. you didn't restore the folder before viewing your Library), then you didn't remove the folder that the game is actually reading. Here's how to find its location:
https://sims4.crinrict.com/eng/2018/07/how-to-find-your-user-folder/
The paths must match exactly up to "The Sims 4." If one of them is a bit different, for example one has OneDrive in its path and the other does not, that's the issue, or at least one of them. It would explain why MCCC isn't showing and why the Library content was still present.