I agree...these 'shifting' borders are ridiculous looking and ruin the aesthetics of the display. As a professional designer of 40 years, the liquid glass look is simply a terrible design and a poor implementation - like most of apple's attempts at visual design. And typical of Apple; they are so short sighted as to implement a visual feature that is sure to be controversial with no option to turn it off.
None of the suggestions work on the newer phones. I have an iPhone 16 Pro and the suggestions do NOT work.
As someone with at least $15k of Apple investment, I have the right to vent and complain in a forum like this, mixed in with my inquiry on how I might disable the feature. Those who rant about the people who are upset about the look of their $1500 dollar phones being degraded by a visually disturbing and overly busy new appearance feature with NO OPTION to turn that feature off, should get off their high horse....posting links to apple's feature suggestiin/complaint site are of no help- we all know this already and many have probably complained there already even though we all know that Apple doesn't really care and if they do decide to modify a feature; it will take them 10 years to do so.