How to Remove an Instagram Account from your Meta Business Account
Before you remove an Instagram account from your Business Account, you must first disconnect the Instagram account from any Pages it's linked to:
Make sure you check the tutorial on how to disconnect instagram account from facebook page if you haven't done so.
1. In Meta Business Suite desktop, click Settings from the sidebar on the left.
2. Click Business assets.
3. Click the "More" dropdown menu. Then click Instagram accounts.
4. Click the Instagram account you want to remove.
5. Click the three dots next to the Instagram account's name and then select "Remove from Business Account" from the options.
6. Click "Remove Instagram account" button from the popup to complee the process.