I've been playing with FOCUS. It's kind of fun.
First thing I tried was to create an automation to run a Focus profile to block all notifications (apart from some important ones) whenever the FaceTime app opens, and to turn it off when it closes. This is because notifications come in loud and kill the FaceTime volume for a couple of seconds. This could be a bug, but anyway. The automation works if *I* open the FaceTime app, but if someone calls me and hence causes the app to open, nothing gets triggered. Useless. Oh well.
Second thing, and this is working well, is I've created a home-screen with a big calendar widget stacked with a mail widget and some apps. Then, I created a Focus which turns this off and turns another home-screen on which has an identical layout, but the calendar widget only shows my work calendar, and the Mail widget opens in my work inbox instead of all inboxes. This is cool!