I cannot use any of the touchscreen buttons along the right edge, including email sends or toggle switches. This problem started with iOS 15 and has become worse with 16. It is clearly a software problem because I can launch the apps in that row from home screen without problems. The area of the screen is also usable in landscape mode and there is no screen protector or damage.
Hard reset doesn’t solve this.
iPhone SE, 13
if it was me then my logic would dictate since Force restart iPhone - Apple Support did not help
then my next step would be to try Restore your iPhone, iPad, or iPod to factory settings - Apple Support
if that also did not help and since not all iphone SE have the same issue then I would say it would be a hardware issue
and I would seek apples help to repair it iPhone Service & Repair - Apple Support
if it was me then my logic would dictate since Force restart iPhone - Apple Support did not help
then my next step would be to try Restore your iPhone, iPad, or iPod to factory settings - Apple Support
if that also did not help and since not all iphone SE have the same issue then I would say it would be a hardware issue
and I would seek apples help to repair it iPhone Service & Repair - Apple Support
Right side of 2020 IPhone SE touchscreen unresponsive after update
