Does it ? I've looked and looked and looked for it. I'm not running Chrome/Windows though, so presumably I'm a second class citizen.

It released a week or two ago, so if you've been using Zoom recently, you might not have noticed. It's under the overflow in the bottom right > change layout.

I'm on Firefox/Mac and has worked fine for me.

yup, rollout date depends on the release schedule of your G-Suite domain https://cloud.google.com/blog/products/productivity-collabor...

I'm on MacOS/Firefox and it started showing a grid view for me a couple of weeks ago. I just assumed they were just rolling it out to replicate Zoom, but maybe it could have been configured somewhere on the G Suite side too.