Window >> Zoom
Zoom in Keyboard shortcut ⌘=
Zooms to double the current magnification.
Zoom out Keyboard shortcut ⌘-
Zooms to half the current magnification.
Zoom drawing Keyboard shortcut ⌘F
Zooms to include the whole drawing.
Zoom objects Keyboard shortcut ⇧⌘F
Zooms to include all selected objects.