Sony ZV-1 Help Manual page 441

If you press the C2 button in the still image shooting mode and eyes are detected, [Eye AF] will activate, and
the camera will focus on the eyes. Shoot images while holding down the C2 button.
Note
If you assign [Follow Custom (
movie shooting mode such as [
movie shooting mode.
If you assign [Follow Custom (
and recall the assigned function when you press the key in the playback mode.
Related Topic
Using Fn (Function) button (Function menu)
)] to a custom key using [
JPEG Quality] or [Flash Mode], the function will not be recalled when you press the key in the
/ )] to a custom key using [
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Custom Key], but the function is one that is unavailable in the
Custom Key], the camera will switch to the shooting mode