Give a skeletal mesh a physics asset.
Go to a constraint, let’s say the knee.
Set the angular limits.
Before 4.18 you could rotate the constraint and offset the angular limits. This enables you to make a knee joint, for example, which only bends backwards.
Currently in 4.23 and rotating the constraint has no effect. So I can’t work out a way to offset the angular limit and setup a knee properly.
I know it’s an old post, but I came here today with the same problem on 2.47.
After a few more hours, I found the answer.
For those like me who realized after posting on the meaning of “ALT yes i is…”
Rotate the manipulator while pressing the ALT key.