Iphone group text? I sent text to 3 people & all 3 where able to see who

Eagertoknow1

New member
else I sent it to & it listed their #? I was not aware of this, I don't care if they know I sent to multiple people but attaching their phone numbers for all to have is so not cool. Does anyone know how to turn that off or block it from giving contact numbers?
 
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