In your Stacker app, you can choose which of your tables - or pages - are visible to your users in your navigation bar.
How to edit which tables appear in your app
To adjust which tables appear in your app, head to your App Settings, and then to the Navigation section.
You'll see that each of your tables has a toggle next to it. Click on this to toggle each table on or off.
Toggling a table off in the nav bar does not mean that users won't be able to access records from it - they can still reach those records through links with other tables or using related lists.
This toggle just removes your chosen table or page from the navigation bar in your app.
To completely remove a table from your app, you should disable it in the Data Sources settings. Find out how to do that here.