Using classic Outlook for Windows in business environments
Hi Janet. I am an independent advisor, trying to help other users in the Community with my experience in Microsoft products. Please note that I am a user like you and don't work directly for Microsoft.
To unlink your Gmail account from your Outlook account and keep them as separate accounts, you can follow these steps:
Go to Outlook.com and sign in to your account. Click on the Settings gear icon, usually found at the top right corner. Select View all Outlook settings at the bottom of the pop-up menu. Choose Mail, then Sync email. Under Manage your connected accounts, find the Gmail account you want to unlink. Move the cursor over the Gmail account and then select Delete. Confirm the action by selecting Save.
https://support.microsoft.com/office/0b9a6b95-ff1b-46c1-bf60-d6b3b82c5ac8
After completing these steps, your Gmail account will be unlinked from your Outlook account, and you can manage them as separate entities
I hope this helps . Regards
Femi