On your computer, open Gmail.
At the top right, click Settings   See all settings.
Click the Inbox tab.
In the "Inbox type" section, select Default. Note: To hide all tabs, select another inbox type.
In the "Categories" section, check the boxes of tabs you want to show. Note: You can't make new tabs; you can only show or hide existing ones.
Scroll to the bottom, then click Save Changes.
Note: If you've turned on notifications, you'll only get notifications about emails in your Primary category.