Hi @acard317, welcome to the Sonos Community!

While not exactly what you’re looking for, you can control the volume of all speakers in a group. A quick way to get them at the same level would be to decrease the volume to 0 then to increase it using the volume buttons on your phone or the group volume slider in the app.

However, I do agree a button to align the volume without having to do the above would be nice, so I’ve marked this thread as a feature request to be passed to the relevant teams for their consideration. If you have any further ideas or feature requests, be sure to post them on the community!