Now that we have the wonderful zoom function,

we also created a small problem.

Namely , where is the end of my screen in a zoom ?????
If you want to fit photos of a different size,

you have search for the edge?
Wouldn't it be better to indicate this edge with a marked frame (size of the edit)

so that everyone knows where the edge is located.
This is woud be an extra for the zoom function,

with pan and zoom you immediately know where your location is