You can’t set the out on an audio track to ‘no output’ when it’s in the track divider section.
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Create Audio track
Press the divide track list button
Drag audio track in to track divide section
Select ‘no output’
It defaults to either a send FX or a mono stereo out instead of ‘no output’.
The track divide is useful to put reference tracks in to. If I’m using the control room and want to use a cue to monitor that track instead, ie so I can flick between my mix and the reference - I’m unable to because I need to be able to select ‘no output’ on the reference audio track.