Tabs are displayed after creating them right away. But if you 15 tabs created and added for an App then while viewing the page all 15 will not be displayed. Some tabs will be displayed according to the page size and rest will be added to List which you can access by clicking dropdown arrow just besides last tab in the row.
Aug 30 2015 01:10 PM
If you want to change sequence of Tabs then edit the settings in App.