How to magnify image regions

To get started, go to the "Edit" menu and choose "Magnify circle".
Move the circle to the region you wish to magnify, right click and choose "Magnify".
If needed, resize the magnify circle so it zooms in to the exact region you wish to enlarge.
If you wish to zoom in onto a rectangular region, go to the "Edit" Menu > "Shapes and outline" and choose "Rectangle outline".