The Separator Bar between the Editing Tabs and the Output Tabs can be used to control the amount of space allocated to each set of tabs.
To change the portion of the window allocated to the Editing Tabs versus the Output Tabs, drag the separator bar up or down to the desired location.
The allocate all of the space to one set of tabs, click on one of the arrows in the separator bar to move the bar in the direction of the arrow. To restore the display of both windows, click the other arrow in the separator bar.
To exchange the positions of the two sets of tabs, double-click on the separator bar.