Greetings, patters5k.
Welcome to the Apple Support Communities. We can understand why you’d want to resolve the issue with your missing PowerPoints.
“What happens when you turn off Desktop and Documents
When you turn off Desktop & Documents Folders, your files stay in iCloud Drive and a new Desktop and Documents folder is created on your Mac in the home folder. You can move files from iCloud Drive to your Mac as you need them, or select all of your files and drag them to the place you want to keep them.
If you turn off iCloud Drive or sign out of iCloud, a new Desktop and Documents folder is created in your home folder. You also have the option to keep a local copy of your files that are in iCloud Drive. If you keep a local copy of your files in iCloud Drive, they're copied to a folder called iCloud Drive (Archive) in your home folder. You can move any files that were in your iCloud Desktop and Documents to your new local Desktop and Documents.” Add your Desktop and Documents files to iCloud Drive
Do you have a Desktop & Documents folder on your desktop? If not, are you able to access the PowerPoints on any other device?
We hope this helps! Thanks for being a part of the community.
Sincerely.