Export selected events issue

Nuendo 14. Why does Export Selected Events always come out stereo? Even when the channel settings are mono, it’s routed to a mono bus, and the files themselves are mono , after export I still always get stereo. Is this some kind of bug?

Is your master bus mono or stereo?

stereo, but i choose “channel settings”. And, actually, i don’t know how i can change master to mono :thinking: