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There's an undocumented nonsensical collections section in the rigid body options (just below the sensitivity settings)
Open, Needs Triage by DeveloperPublic

Description

System Information
Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.70

Blender Version
Broken: version: 2.81 (sub 5), branch: master, commit date: 2019-09-03 16:04, hash: rBb3b59e3b5657
Worked: (optional)

Short description of error
There's an undocumented nonsensical collections section in the rigid body options (just below the sensitivity settings)

unless this is it from the manual? If so, the description is about as clear as mud :) :

"Collision Groups
Allows rigid body collisions allocate on different groups (maximum 20)."

Details

Type
Bug

Event Timeline

Rigid bodies can be configured to only be affected by certain collections. This is very briefly mentioned here: https://docs.blender.org/manual/en/latest/physics/rigid_body/world.html

Within Blender, the limit needs to be removed and converted to using named collections.

Currently I am not sure how it works, maybe collections are mapped as they appear in alphabetical order? Or this might not work at all currently?

Indeed, we probably should just use regular Collections here.