Please forgive me ... Did iOS6 have larger (or smaller) app icons ?
ie:
Seems you can use "Zoom" for larger > cause here's Apple's way to turn it OFF
If your Home screen icons are magnified on your iPhone, iPad, or iPod touch - Apple Support
Online (non-Apple) article:
"iOS 16.2: How to Change Apps icon Size in iPhone, iPad"
https://www.howtoisolve.com/how-to-change-apps-icon-size-in-iphone-ipad-resize-app-icon/
ie: Settings > Display and Brightness > View (Display Zoom) > select Standard or Zoomed .... tap on Set . "Your iPhone will see the Changes after reboot once."