[Mailman-Users] How do I remove the Sender option?

[Sub Zero]

Hello,

I have removed the "Sender" header from one of my lists and now I want to
remove it from all my other lists too.  I don't know how I did that :( but I
want to do the same for my other lists.  Can anyone point me to a right
direction please?

Have a nice day.
--
SubZero