When I first tried the stationary boundary on my Oculus Quest 2 I was incredibly annoyed because it was way too small. Any small movement I made was causing the guardian to appear and completely killed immersion. And if I turned off tracking it made most of my apps unusable. Worse, there was no way to make the stationary boundary any bigger (at least as of this writing in October 2021).
However, there is an easy fix to this. Simply switch to a roomscale boundary and draw a big circle around yourself.
I didn’t think this would work initially because my couch was up against a wall. But, the roomscale boundary can actually be drawn right through walls and other objects. At least far enough through walls that the guardian won’t constantly be popping up and annoying you.
Just remember to stay on your couch when taking this approach vs standing up and trying to walk through your wall.