Well, it looks like reverting to Stable seemed to at least partially fix it for me. The keyboard is still higher on the screen, but at least it fits to the screen width correctly. Thanks!

I couldn’t find any mention of anyone else with this issue around the web or on valve’s GitHub issue tracker, so I assumed it was something dumb I’d done rather than a bug.

I am currently on the latest beta - I’ll test the stable/preview channels in case that makes a difference.

They intentionally removed this feature years ago. It was possible to reenable via a dconf setting for a while but I believe that was also eventually removed.
So annoying.

I use touchpad to look and spin around quickly, but gyro to make small aiming adjustments.

What’s wrong with the trackpad? I find using the trackpad to look around in FPS games is much better than the right stick.