Cannot mute only local speakers - SWYH mutes as well

I’m running windows 10. I see that SWYH only streams what I can hear on the main speakers. If I plugin headphones SWYH stops streaming. If I mute the local speakers SWYH again stops streaming.
Is there any way on win 10 to mute the sound locally but for SWYH to continue streaming the sound?

It seems like the odd thing is that SWYH doesn’t work for you when headphones are plugged in. It works for me, for what it’s worth. Have you tried left clicking on the speaker icon in the task bar, then clicking on the up arrow icon “^” in the upper right of the window that pops up? Is there some other playback device you can choose that makes SWYH work with the headphones for you?