I guess you mean the "Hardware Integration Settings".
Some PreSonus devices have support for additional hardware integration. For example settings for a Talckback microphone, several speaker outputs, Headphone Outs for cue mixes, phase and phantom power settings.
On the right side of the pic you can see this hardware controls [right to the MAIN channel].
The button under the wrench icon (options dialog) is called "Restore Audio Device Settings" and allows you quickly to recall your last device settings if you made some changes.
You can turn on and off the hardware integration view in the options dialog by checking the "Show audio device controls".
I'm using the PreSonus Studio 192 Mobile audio interface which does support this integration.
Gottfried