Click the Arrange | Move | Forward command to move the selected objects forward one layer. Objects can also be moved by dragging them to a new position in the Object Manager.
In the left drawing, the red square is located behind all the other objects. Use Move Forward to move the square forward one layer so that it appears between the circle and the triangle (middle drawing). Selecting Move Forward again places the square on top of the other objects (right drawing). Move to Front also places the square on top of the other objects.
See Also