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Thanks for your question. Can you confirm if the Google account appears under your Mac system preferences, in OneDrive settings, or in Office apps like Excel?
To remove it safely, open OneDrive, go to Settings, select Accounts, and choose “Unlink this PC” for the Google account you no longer use. Then, check Office apps under Preferences > Accounts and sign out any Google accounts listed there. This ensures your Microsoft apps only use your Proton account and prevents old accounts from syncing or appearing in the interface.