Green Border line is not visible

[Ganesh4]

Hi team, 

In a meeting of 700 participants, if the host video has been spotlighted and the green border has been fixed to the host. When other participants talk, the line to indicate which participant talking is not visible. How to make it visible as the current one has just a small yellow line and it would be better if they move to the first page when they talk and a green line box indicating who is talking

.