When you add content to your site you might not want it to show in the default search. For example if you create articles that a specific to a structured topic, or a getting started guided, or maybe a strength training video that you only want to show in workouts not in the default video search page.
This is currently possible in both videos and articles.
To hide the video or article edit it and check the "Hide from uncategorized search" checkbox.
Now the content will only show in the search if that contents category is selected in the filter. This also enables you to use in a custom categorized menu item,