How to include all original recipients in header of the replied message?

wklui

New Email
When I forward an email, all the original recipients are listed in the header of the forwarded message. However, when I reply to an email, only the sender is listed in the header. How can I change it to include all original recipients in the header? That used to be the default for years but I think it changed when they switched to the new Yahoo Mail. Thanks!
 
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