@jurassicpug1 Are you saying that half of your save files are missing, or that the files are there but don't show in-game? Let me know, and please also post a screenshot of the contents of the saves folder, as in, I'd like to see the file names and dates.
If you want to get rid of OneDrive, or at least stop it from touching your Sims 4 data, here's how (pick the option that works for you):
In any case, make sure you back up all the data you want to preserve before proceeding, and that Sims 4 is actually using the folder you want it to when you're done. For the latter, here's how to check:
https://sims4.crinrict.com/eng/2018/07/how-to-find-your-user-folder/
