What is the problem?
I changed the config file to "USB" camera, and added resolution settings for 1920x1080 and 15fps.
On the 'control' page, the camera still shows up fairly low quality, and it's a 4:3 aspect ratio instead of filling the full widescreen.
What did you already try to solve it?
Changed the config file, that's all I knew to try.
Edit: In the octoprint webcam page, there's a setting to swap between 4:3 and 16:9, but it's already on 16:9. I toggled it just in case, but no effect.
/var/log/webcamd.log, syslog, dmesg, ... no logs, no support)
No logs, because... I mean what log would help with this?
Additional information about your setup (OctoPrint version, OctoPi version, ...)
Current version of Octoprint (1.3.12, far as I know). Pi 3b+.