The Layout panel of the Viewport Configuration dialog specifies the division method of viewports, and assigns specific types of views to each viewport.
The Layout page is arranged in three general areas. At the top of the page are icons representing the possible division methods. Click on an icon to select the division method, which appears in the larger screen representation.
To assign specific views, click in the viewport in the screen representation. A menu lists the various viewport types.
An additional area provides two option buttons labeled Layout A, and Layout B. These store two complete layouts by default. Layout A uses four viewports, and Layout B uses three viewports with Track View assigned to the wide viewport.