Full page screenshot.

Apple configured the ability to use full page screenshots in Safari and that was it. Why Apple did it that way was up to them and we are users and not priviledged to why they do what they do.

If you would like to see a change to that feature, then provide feedback to Apple here, Feedback - iPhone - Apple

Yes, I am also very upset about this problem, maybe you can try Picsew like me. In Picsew, select several pictures to be stitched according to the sequence of screenshots. Click the option of "Long Screenshot", Picsew can seamlessly connect these several pictures. Similar long screenshots can be achieved by eliminating the overlap between each screenshot through the algorithm.

Thanks

Maybe try asking the other web developers? Because only safari is developed by Apple so it gets the full screenshot

I see… I don’t use android so I am not sure about that. Safari is the only browser I use on iPhone.

Sorry to be not able to help.