To record videos without sound from the Sendspark Chrome Extension, simply:
Click on the ellipses next to the recording icons
Toggle sound off
Now, no sound will be captured while you record. 👍
This will only work when record with Screen or Both. You can NOT record a face video without sound.
This setting will save to your defaults, so make sure to toggle sound on again next time you would like to speak while recording! 🔇