I checked the specs in my manual and it says NO zoom for photos, only zoom for video. I have only had mine up 1x so I'm surely not the expert.
But did you check the release notes for latest firmware?
DJI Mini 2 Release Notes
Date: 2020.12.28
Aircraft Firmware: v01.02.0000
Remote Controller firmware: v02.00.1200 DJI Fly App iOS: v1.2.2
DJI Fly App Android: v1.2.2
What’s New?
Added zoom to photo mode.
Added 48/50/60fps shooting frame rate for 2.7K video.
Optimized Wi-Fi/Bluetooth connectivity, providing a faster and more stable connection.
Increased flight stability in some scenarios.
Fixed issue: abnormal color appeared in panoramic DNG photos.
Fixed rare issue: abnormal texture appeared in the upper left corner in 4K videos.
Notes:
Added features require DJI Fly v1.2.2 or later. For Android users, visit DJI official website to update to the latest version.
DJI Mini 2 - Downloads - DJI