Sonore SE and Matrix

When I log into Sonore SE setting webpage, this is the USB out setting I see. USB out is connected to Matrix.

Is my settings the most optimal agreed upon one?

Also when I do DAC diagnostics (I did when there was no music playing), I get the following output and I see playback channel as mono, why?

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Simple mixer control ‘X-SPDIF 2’,0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 127
Mono:
Front Left: Playback 127 [100%] [0.00dB] [on]
Front Right: Playback 127 [100%] [0.00dB] [on]
Simple mixer control ‘X-SPDIF 2’,1
Capabilities: pvolume pvolume-joined pswitch pswitch-joined
Playback channels: Mono
Limits: Playback 0 - 127
Mono: Playback 127 [100%] [0.00dB] [on]