Detail Magnifying Glass: (this is an improvement of the existing feature)
Actively follows vectors when drawing.
It is a scalable magnification window. (magnification amount can also be customized)
This means that you can see a zoomed-in portion as well as your artboard
Fixed Canvas projection window: (it will not change when you zoom in or out)
Displays a specified area on the canvas so you can keep an eye on your work when the selected canvas/ artboard is zoomed in.