It seems Google is testing (or it is a bug) showing the image full screen. Khushal Bherwani first spotted this and posted on X saying, "Google with full image on desktop serp, when click on image ...
Step 2: Select an image that you'd like to save to your photo library or share to another app. It will open in a full-screen view. Step 3: Select the Share button in the bottom-left corner.
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