To hide the category itself and all content inside from end users, Unpublish the category.

When a category is unpublished, the Published label will no longer be visible on the category in the dashboard.

You can decide which users see which help categories by assigning/unassigning user categories.

Note: If all user categories are unassigned, the category will not be visible to any end users but if published, will include the published label in the dashboard.

You can choose to permanently delete categories from the Support Center by clicking the Delete Category link.

All of the Out of the Box support articles will still be available in the Manage Articles section of your Dashboard but without a Support Center category, but will not be immediately visible to your end users.  They may show up when users search keywords through the Support Center if the word is in the title of the article.

To make articles completely unavailable to your users, use the Columns Visibility button [1] to select Categories [2].

Use the Filters  button [1], select Categories [2],  and filter on the Support Center categories [3] you want to remove.

Note: Use a separate filter to capture all the sub-categories.

Select the Articles you want to hide [1], then click the Edit Status link [2].

To make the article unavailable to users, click the Hide/Mark as draft button.