Hi Billie,

You have this problem in old datebase(database defined before removing that module), it will not appear if you create new database. Or if you want to remove that module from current database, you can follow these steps:-

1. Go to Settings==> Users

    Then enable Technical Features and refresh page,, Now you can see extra menu's in Settings

2. Then select that removed module from more click delete that module

3. Now restart the odoo server

4. Then go to settings and update modules by clicking Update Modules list

Now the problem will be solved. Please let me know if this helps.