https://wccftech.com/airtag-precision-finding-houses-a-hidden-developer-mode-how-to-enable-it/

A user showed frustration with Apple's AirTag and discovered a hidden 'developer mode' in the Precision Finding interface. The entire operation is present inside the Find My app used to locate lost belongings. If you are interested in trying it out for yourself, scroll down to see how to enable the hidden 'developer mode' in Find My app's Precision Finding interface.

Apple's Precision Finding feature provides users with on-screen directions to find nearby AirTags. Only iPhone models with a U1 chip can take advantage of the feature and as of right now, only the iPhone 11 and iPhone 12 seem to be compatible. The devices make use of the camera, AR, UWB chip technology, and haptic feedback to better locate the AirTag or the belonging that it is attached to. However, the hidden 'developer mode' in Precision Finding is a pretty neat find by the user.