Use HD video instead of Standard video
Click the caret next to the camera icon that says Stop Video or Start Video.
Click Video Settings.
On the right side of the pop-up window, check the box next to Enable HD.
Exit the pop-up window.
Enabling a larger number of participants' videos in Zoom simultaneously
Access the Video Settings again.
On the right side of the pop-up window, check the box next to Display up to 49 participants per screen in Gallery View.