The user also has the option of maximizing a given window by clicking on the maximize icon on the window title bar:
Doing this will cause the chosen window to fill the entire portal space:
Subsequently the window can be restored to its previous size and position by clicking on:
Similarly, a window can be minimized. This closes the window but leaves an option to restore the window from the menu bar.
Finally, the window can be completely closed by clicking the cross icon in the top right-hand corner.