Set Isometric Grid and Snap
 
 
 

To turn on an isometric plane

  1. Click Tools menu Drafting Settings.At the Command prompt, enter dsettings.
  2. In the Drafting Settings dialog box, Snap and Grid tab, under Snap Type, select Isometric Snap.
  3. Click OK.

Alternative

You can cycle through the three isometric planes by pressing F5.

 Command entry: DSETTINGS