Changing Placement of the Editor Tab Headers
By default, the tab headers appear on top of the editor, but you can change their location as required, and have the headers at the bottom, left, or right sides of the editor. Note that the tab header placement is a global setting that applies to all projects.
To change location of the editor tab headers, do one of the following
In the Editor Tabs settings page, select editor tab headers position from the Placement drop-down list.
Right-click an editor tab, point to the menu item, and then select the desired placement in the sub-menu.