Unity 2020.2.6 2D physics material does not exist.

The menu Create->PhysicsMaterial 2D, do not exist in my Unity for Mac.
Where i found it?

See this post here . The Physics 2D material was moved to a separate "Assets → 2D " sub-menu but unfortunately that sub-menu was disabled when the 2D sprite package wasn’t installed. The fix is being processed here.

I installed all 2D packages manually, and re-start unity … its working

You only need the Sprite package and shouldn’t need to restart Unity but glad you got it working.