Are you asking for the pop-up to display unclipped?

The Image > Photo pop-up is only designed to pop up what is showing in the thumb.

You could position four touching rectangles to make an aperture so the original seems cropped but then pops up to its full size and dimensions.

The other way is to make each photo link to a pop-up layer where you can have the original and embellish with other details.

Acorn