Tab Area
The Tab Area is the portion of the graphical user interface that contains the browsers, utilities, and other functionality not shown in the panel area.
The Tab Area can be turned on or off from the View menu. A check mark indicates that the Tab Area is currently displayed.
The Tab Area can be positioned on either the left or right side of the modeling window, both, or turned off completely by selecting Left, Right, Expand Both, or Collapse Both from the menu.
To maximize available space, multiple features (browsers and utilities, for example) are organized onto tabs; click a tab heading to bring it to the forefront.
The Session Browser and Media Browser are displayed in the tab area by default. Other browsers, windows, and toolbars can be displayed on or off via the View menu.