In addition to the Bring To Front layering tool, VTS provides you with a Send To Back tool that enables you to change the layering position of a selected object in relation to other objects by sending the object to the bottom of the stack.
To change an object's position, select the object and click the Send To Back button. The object will appear on the bottom of the stack.

In the example below, the red triangle will be moved to the bottom layer using the Send To Back button.
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The red triangle appears in the middle layer. |
Select the red triangle. |
Click the Send To Back button. |
The red triangle is moved to the bottom layer. |