I'm glad you've reached out to the QuickBooks Community, @jgilligans.
Let me help ensure that you’ll be able to stop the multi-user access in QuickBooks Desktop.
To do this,, let's make sure you’re logged in as the Administrator. Once done, please follow the steps below:
- Click File at the top menu bar.
- Under the drop-down list, click Utilities.
- Choose Host Multi-User Access.
- Click Stop Hosting Multi-User Access to turn it off.
For future reference, you can check this article: Host your company data file in multi-user mode.
This will get you on the right track. Please know that I'm just a post away if you have any other questions about the hosting multi-user mode. Have a good one.