How to disable QR code reader mode?

Recently, a new QR code reader was apparently added to the camera app.
It means that the toggle between photo and video (which I use a lot) is now a 3-way mode roundtrip phozo-video-qr, and it takes extra (sometimes critical) time to switch from video zo phozo mode.

How can I disable it? I found no obvious setting for this…

My app version: 1.52