This conversation has been merged. Please reference the main conversation: Lightroom: Applying Auto Tone to a batch of photos loses subsequent develop settings
1. select 1200 photos
2. Ctrl U - Auto Settings
3. select only first photo
4. change contrast and shadows
5. select all (viewing first photo with changed contrast and shadows)
6. Sync - checked only contrast and shadows
Note: This conversation was created from a reply on: Lightroom Classic: Sync not working properly after Auto settings.