It would be nice to have a Maximum button/option in the Image Widget so the user can maximize the photo in case they want to see a larger picture.
One workaround could be use of Window widget and connect it to the same data. And then set the "Set Link" option for the image widget that can open the Window.
In the recent AGOL release (25 June), a new option "Image viewer" is provided so that you can click and see the enlarged images, panning, zooming, or see further details in a modal:
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