Zoom Selected
The View | Zoom | Selected command magnifies selected objects to the maximum size possible in the plot window.
Select an object in the plot window or Contents window and click the View | Zoom | Selected command or the 
button to fit the view around the selected object.
Zoom with the Keyboard
You can use keyboard commands to zoom to the selected object in plot window. The default keyboard command for the View | Zoom | Selected command is CTRL+L.