Well, resuming my opinion so far… There’s three possibilities for this situation:
- Both teams had the same idea separately, Penpot dropped it and Figma continued.
- Figma took inspiration of Penpot’s UI alongside other floating panel interfaces and did UI3 from it.
- They just straight copied Penpot’s interface concept that was available on the website.
Talking a bit more about this here:
By the way, I like the new interface, but would love to have some customization features on it.