In WMR it's kind of a PITA compared to oculus. You have to put a shortcut to the program you want into the start folder so it'll even show up. Then from the cliff house, using the controller, it's windows button, click on apps to the right of the main menu that comes up, then classic apps, if you did the shortcut right the program should show up in that list. Scroll thru to find it I. Click on it, it should start in a window. You might have to toggle focus with windows key+y to get it to start right. Don't forget to toggle back. You can re-size that window and click on one of the icons at the top that's "follow me". It's now pinned in VR and will follow you until you shut it down.
I use an app called Chatty to put my twitch chat in VR. Have to do the win+y thing to get it to go but it works. Handy app. I get a little ding when somebody is watching or chats with me. Can't type in VR but have a button set up to talk to the stream so do it that way.
Oculus was so much easier. Just start the program and select it from a list of active programs to pin. Done.
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