Go to the Google Drive app on your computer. Click on it. You will see some dots in the upper right—click on those dots….then choose the Accounts tab.
You will disconnect your Google Drive app from the other person’s account.
Then you next need to find the Google Drive folder on your computer. If it’s windows, you should find it under your C drive/Users/yourname/Google Drive
Delete all the files in that folder, but I usually do not delete the folder itself.
Next go back to your Google Drive app, to the dots, choose Accounts and connect your Google Drive app to your Google account. The files should start syncing pretty much immediately.
There may be other ways, but this is what worked for me when we switched to a new domain at the school I am helping out at.
Suzette Moskwa