Additional features, settings, or issues not covered by specific Microsoft Teams categories
Hi Kiki2424,
Well, currently there is no such a setting to control the participants to be muted by default while they enter into the meeting. The only way is either the meeting organizer to mute them or the participants themselves to mute the mic.
I agree with you that it should be much more convenient to mute the participants by default while they enter into the meeting. Here I can recommend a workaround that is the meeting organizer can edit the Teams meeting email invite with adding some bold words "please mute the mic while you enter into the meeting".
Definitely, this is just a workaround. So I'd like to invite you to leave a feature request feedback to our Teams related team via https://microsoftteams.uservoice.com/forums/555103-public. Your valuable feedback should bring this feature in soon. We cherish your understanding and effort.
Regards,
Alan