How do you remove volume automation from a track? (No minus sign is visible.) – Tracktion Forum

Hi all,
In Waveform 12, according to the manual, we should be able to remove a track’s volume automation by clicking a small minus sign in a square next to the “A” at top right of the track, but I don’t see a minus sign; I see only a plus sign. So How can I remove the volume automation from a track, so that I can use the volume+pan plugin again? (The volume setting in the volume+pan plugin seems to be fixed on tracks that have volume automation active.)
Thank you for any help.