Hi rmapetro and welcome to Moon Zoo.
Having a zoom feature on the Craters page would distort the crater size analysis.
If you want to see zoomed in areas of the Moon, use the LROC Image Map
tool which allows you to look at the NAC strips and zoom in. You can also download the NAC strips to your PC/Mac and use an image viewer.
You could also use the ACT-REACT
tool which allows zooming in on any area on the Moon.