Jibri Live Stream Panelist Appearing As Small Squares

I currently have built a custom solution using the low level jitsi api, not the Jitsi app. When it I livestream to jibri, the output stream like small squares on the right:

How can I get the layout to space evenly as large, evenly spaced square with Jibri? For a custom layout, is there an ID or a special html mark-up I have to use to capture the current screen?