18.2.11 Object to Background (Menu Command)
If several elements overlap, you can change the position of any element within the display level. The display level indicates the position of the element within the level. If a line button is partially covered by another button, you can move the button located in the foreground to the back.
To move an object to the background
1 Click with the right mouse button on the element whose position you would like to change.
The context menu will appear.
2 Click on "Object to Background”.
This will make the element the last element in the display level.