Using AutoSnap
To change the AutoSnap settings
- From the Tools menu, choose Object Snap Settings.
- In the Osnap Settings dialog box, choose the AutoSnap tab.
- Change settings as needed:
-
Marker turns the marker on or off.
- Magnet turns the magnet on or off.
- SnapTips turns SnapTips on or off.
- Marker Size adjusts the size of the marker.
- Marker Color changes the color of the marker.
Display Aperture Box turns the target box on or off when you specify an object snap. This setting does not affect object snaps when you are not using AutoSnaps.
- Choose OK.
Object Snap toolbar: 
Command line equivalent: DDOSNAP
Alternate: SHIFT + right-click (for cursor menu)