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To work with the Audio Mixer:
What do the parts of the Audio Mixer do?
What it is
What it does
Preview/Audio Mixer toggle
Allows you to choose between the Preview screen and the Audio Mixer.
HDMI source audio
Capture app source audio
Same as for HDMI source, above.
Note that, by default, the audio mixer setting for any of these is AFV mode:
Meanwhile, by default, the audio mixer setting for any Line-in connection is Always On mode.
Therefore, if there is a Line-in connection, by default it is the program audio unless you mute it by tapping the speaker icon.