Google recently announced tiled layout in Meet, where you can see up to 16 other participants in your meeting. There are new improvements to that layout to allow you to see other attendees even when someone is presenting. Presentations appear in a large tile with the most active participants to the side or bottom.
When you choose a new layout, this layout will be automatically saved as your preferred layout. This means it will be automatically applied for your future meetings, until you select a new one. Google also made some minor improvements to the meeting UI to better utilize the space on your screen.