This new feature within Teams will allow you to change the layout to Together mode or Large gallery during a meeting that is conducted in Edge or Chrome browsers.

How will this affect you and your organisation? 
This new release will improve the experience for everyone who joins a Teams meeting in Edge and Chrome browsers. by positioning up to 50 invitees into a virtual space by removing each persons background and replacing them with a common background.

You can turn on Large gallery from uBar.

Image is not our own. Image courtesy of Microsoft, taken from Message Center email: (Updated) Large gallery view and Together Mode for web meetings in Edge and Chrome browsers

Image is not our own. Image courtesy of Microsoft, taken from Message Center email: (Updated) Large gallery view and Together Mode for web meetings in Edge and Chrome browsers

When will this happen?
This will begin rolling out in late March and is expected to be complete by late April.