Bring to Front
The Layout | Arrange | Bring to Front command or the 
button moves the selected object or objects to the front of the plot document. The object will appear on top of the other objects. Alternatively, right-click the object and select Order Objects | Move to Front.
Objects can also be moved by dragging them to a new position in the Contents window.
The default keyboard shortcut for the Layout | Arrange | Bring to Front command is SHIFT + PAGE UP. The keyboard shortcuts can be customized with the Customize command.
Example
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In the left drawing, the red square is located behind all of the other objects. Use Bring to Front to move the square to the front layer so that it appears in front of all the other objects (right drawing). The Bring Forward command moves the square forward one layer at a time.