The Send to Back option moves a currently selected figure(s) behind all other figures residing within the same layer. At least one figure within a layer must be selected for this option to be enabled. Use one of the following methods to send a figure(s) to the back of a layer:
Select the Arrange Menu and choose Send to Back.
Open the Contextual Menu, select the Arrange Submenu, and choose Send to Back.
Use the Sent to Back button located on the main toolbar.
Use the Shift-Command-Opening Bracket keyboard shortcut.
The following images display the position of a selected pentagon prior to and after using the Send to Back option.