Use the View menu > Show All Objects command to immediately remove the effects in the active window of the View menu > Show Selected Objects Only command, the View menu > Make Selected Objects Invisible command, and the View menu > Invert Visibility of Objects command. In other words, this command shows all objects in the model.
Note: Right clicking anywhere in an active window will display a pop-up menu of commands, including the Show All Objects command. Clicking that command is the same as using the View menu > Show All Objects command.
See also