A Microsoft file hosting and synchronization service.
Hi Todd. Welcome to the Microsoft Community.
Go to the OneDrive Settings > Sync and Backup > Manage Backup and toggle the sync of your folders to ON.
At OneDrive Settings > Account > Choose folders, select "Make all files available."
Folders with greyed-out checkmarks are pre-checked and cannot be unchecked. They are available on your PC.
Now, your folders should show in File Explorer.
I hope that helps. Feel free to ask for further assistance.
Best Regards,
Craig