Microsoft Teams Large Gallery view allows Teams users to have video feed of up to 49 participants in a single screen during meetings. The new Large gallery view will be available when at least ten people have their cameras turned on during a Teams meeting. In the Large Gallery view, you can interact with the meeting participants via actions like pin and spotlight and observe their meeting activity like raise hand and reactions.
In Large gallery view, navigation controls < > will appear at the bottom of the gallery when there are more than 49 participants. You can use these controls to view more video participants.
Microsoft has now confirmed that Interactive Large Gallery view will be available to Teams desktop and web users next month (September 2022).