>>294569485
Many people recently started using XSOverlay, so I did, too. You can pin arbitrary amounts of arbitrary windows to be visible while ingame there as well.
You can interact with them ingame as well. I usually have one floating behind me to do little stuff while waiting for people (e.g. after swapping worlds).

I haven't tried any of the alternatives yet, though. Lots of people also use OVR Toolkit.