Control room monitor out plays monophonic

Why the control room monitoring plays monophonic?
DaVinci has default settings for sound. Audio source is stereo.
If I set Main bus to Audio Outputs in Patch Input/Output, the sound plays stereo.
But I do not want to set every timeline again and again to hear the sound right
DaVinci has default settings for sound. Audio source is stereo.
If I set Main bus to Audio Outputs in Patch Input/Output, the sound plays stereo.
But I do not want to set every timeline again and again to hear the sound right
