I don’t know why, but all my folders and things that were on my desktop before our session, are not there. Please tell me how to restore them. You may recall we switched AppleIDs on my computer.
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Sounds like Mike was probably syncing your desktop and documents items to his cloud space. Should be an easy fix. I’m happy to assist but if you’d like to try on your own here’s what you can do:

Go to iCloud.com and log into HIS iCloud account (based on yahoo.com). Select iCloud Drive from the menu.



Locate the items you want back. You can hold down the option key while clicking to select more than one file at the same time. Note, you cannot select folders using this method.
Then hit the download icon at the top. Those files will now be in your downloads folder and you can move them where ever you’d like from there.