Meet has a setting that lets you choose how to see people. By default, it shows up to 4 people in equal tiles. After that, it puts the talker large and a few people in small tiles to the side.
But there's a layout option in the vertical dots menu that will let you force it back to 4 large tiles. You cannot specify how many tiles, though, it's always 4.
There is no gallery view available for Google Hangouts (I've searched heavily for it in the past week, if it exists please enlighten me).