The Layout Manager combines up to 5 panels or "layout units" with the central, mandatory one taking whatever space is left by the up to four resizable panels above, below, and to either side of it. Each of the layout units is in Standard Module Format, with header, body, and footer sections. This is what it looks like:
The image shows the right panel collapsed, so only a thin strip with the expand icon is all that remains of it. All the other panels are expanded and have their position as their header. The ability to resize, the collapse and close buttons, the scrollbars, the header, and footer shown are all optional and have been explicitly enabled in all except in the center panel where some of the options are not valid. The center panel will always be resized to whatever space is left by the others and it cannot be collapsed or closed. The whole page takes all the viewport. Even if the browser window is resized, the Layout Manager will adjust the panels to fit in the...