View and Edit Tab Settings in Permission Sets

Tab settings specify whether a tab appears in the All Tabs page or is visible in a tab set.
Available in: Salesforce Classic (not available in all orgs)
Tab settings available in: All Editions except Database.com
Permission sets available in: Contact Manager, Professional, Group, Enterprise, Performance, Unlimited, Developer, and Database.com Editions
Profiles available in: Professional, Enterprise, Performance, Unlimited, Developer, and Database.com Editions

User Permissions Needed
To view tab settings: View Setup and Configuration
To edit tab settings: Manage Profiles and Permission Sets
  1. From Setup, in the Quick Find box, enter Permission Sets, and then select Permission Sets.
  2. Select a permission set.
  3. In the Find Settings... box, enter the name of the object you want and select it from the list, then click Edit.
  4. Specify the tab settings.
  5. Click Save.

If Salesforce CRM Content is enabled for your organization but the Salesforce CRM Content User checkbox isn't enabled on the user detail page, the Salesforce CRM Content app has no tabs.

Note