How to standardize the tab layout for all Users?
To standardize the tab layout:
- Click Edit to the left of the app selection.
- Add or remove the tabs needed using the Selected Tabs and Available Tabs lists.
- Change the order of the Selected Tabs by moving them Up or Down using the buttons on the right of the Selected Tabs box.
Also, be sure to enable the box Overwrite users' personal custom app customizations so that the tab order appears the same way for all users.
Salesforce Help Documentation: Salesforce Developer - Tab Order