PSE 2018 navigator question

I just started using PSE 2018 last week (after using 11, 10, 8, 6 and 3 for years.) The navigator view window is handy for moving around an image especially if zooming on a small part to check details or clone out a blem. The navi view window shows the zoomed-in part of the image. However, after the original (full-size) image is cropped, the navigator window shows only a tiny image inset ... see second image below. Instead of filling the navi window, the reduced image is very small (proportional to the amount of size reduction). Even if the reduced-sized image is zoomed, the inset in the navi window stays small. If the cropped image is saved, closed and reopened, then the navi window shows the image as full size again.

Is there a way to increase the image size in the navi window without closing and reopening? This did not happen in previous versions. 

Thanks, 

Clive





This shows the cropped image.