Hello, the block api v3 is a really good upgrade of the system but it doenst work in a user friendly way.

Mode function is removed and its always in preview mode. This results in a sidebar with all acf fields cramped up against eachother. I would suggest the Mode comes back to fix this issue.

Mode: auto -> When block is clicked the popup opens. (no acf in sidebar)

Mode: preview -> When block is clicked acf shows in sidebar. (pencil opens popup)

Mode: edit -> Removed. Doesnt work with iframe system right?

More info about my issue is in this post: https://github.com/AdvancedCustomFields/acf/issues/955