Hardware prefs

I’m trying ardour for the first time in linux. How do I change the hardware outputs? I cannot seem to find a hardware and sample rate prefs.

Depending on the version you have, chances are this is managed by Jack. You need to change these settings in Jack, which you can do in one of two ways, with an external program before you start Ardour, or if it is not running when you start Ardour you can see an Audio Setup tab to change this.