You cannot, that's how Microsoft designed the Group reply functionality and they havent provided us with any options to customize it. Much like they decided to not expose Sent Items and other folders. So in other words if you need such functionality, use Outlook. Or create a "traditional" DG or a shared mailbox as applicable.
Why OWA group email has only Reply-all option?

Apparao Checka
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I created a user group. I sent email. When they reply it sends to all the members in group. I checked and found that only "Reply-all" option is available. I do not want the reply all option. By default it should have Reply option. 1) I need to have "Reply" only option. 2) "Reply-all" option should be optional. Can anyone suggest how do I solve the above problem? Thanks in advance.
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Apparao Checka 21 Reputation points
2021-02-27T08:59:54.383+00:00 Thanks for the reply. I will ask the users to download outlook and try it. Hope this will solve the issue.