Since serveral versions of the software the auto zoom feature of the watch is broken. In contrast to the developers I think it was never fixed.
See also: Auto zoom doesn’t work - Forerunner 965 - Running/Multisport - Garmin Forums
According to the manual it should be available:
Effective 09/16/25 3:19pm
But I think now it was finally given up
Forerunner 970 Auto Zoom - Forerunner 970 - Running/Multisport - Garmin Forums
Probably the developper who war coding the function quit and now it is unrepairable forever. 
Can anybody here confirm that it is not working or are some people (including me) just to stupid to use it.
