To create a new tab, click on the "+" button in the tab navigation bar. A new tab with the default name "Tab - n" is created.
To rename a tab, hover near the name of the tab to which you wish to make changes to, and click the edit icon. You can then make changes to the text, and click enter.
To duplicate a tab, open the tab which you wish to duplicate and click on the "Clone" button. A duplicate of the tab with the default name "Tab Name - copy", will be created.
To delete a tab, open the tab which you wish to delete and click the "Delete" button. You will be asked for a confirmation, on accepting it that tab will be deleted.
Please note that deleted tabs cannot be recovered.
Learn more about creating, duplicating and deleting widgets.