Expanding images

I have stored about ¼ million images on my Synology NAS drive DS1618+.

I am wondering if there is a way to enlarge the image (focus + into the image to review just a portion of the image

something similar to the circled + sign on Preview on the Mac to zone in.

BTW - I am not sure where this Topic should go here. Please excuse me if I got it wrong.

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