Increase Image Previewer

My client is uploading some tall product images to her store, and she’s trying to preview them using a small laptop screen. The previewer window is too small, so she has to click and drag the image to view all of it. She hates this. How can I make the previewer window large to display more (or all) of the large image?

It’s not possible :(, at least out of the box.

I would suggest that you reupload the images and place a ‘container’ of dimensions to upload. I typically ensure that images are 600px by 600px MAX and provide download links for anything else.