PRIMER 22.1
"Zooming In" (Magnifying an Area)
"Zooming In" (Magnifying an Area)
| ZM | Zooms in by using the cursor to pick a rectangular screen area that is to be enlarged to fill the screen (also available from shortcut key Z). |

Both the scale and the current image centre are changed.
When defining the rectangle with the cursor you can "rubber-band" the box by picking its first point, then pressing the button and moving to see the effect of the second point.