Oftentimes, you need to make certain content available only to your registered users. Follow the below few steps to do that. Note: the term, 'Category' and 'Page' are used interchangeably.
1. Admin > Customize > Content. Click to edit your app.
2. When in the content editor, click on the category to get the context menu. Then select the 'Edit' option on the content menu.
3. In the category edit screen, go to the 'More Options.'
4. Move on to the 'Settings' tab and enable 'Requires to be logged in.'