Hello,
v19.12.3 : disable audio in a complete video track is not possible. Sound symbol is missing left hand side of every video track. Only Video symbol for enable/disable is shown.

Who can help where to get the option for audio? - I worked with 17.4 so far, sound option was alway shown. Now I'm working with xubuntu 20.04

tia
Eckard

@ok. solved! Audio is separated in extra track No. 3 at bottom. I just detected it!