The Cubase documentation mentions being able to mute individual segments while working in VariAudio with Pitch and Warp turned on. It mentions hovering over the bottom border to show an “X” at the bottom center of the segment. I cannot see an “X” when I do that operation. I went into Preferences and made some changes to editor and audio settings and then was able to see the “X.” I made a few other changes in Preferences and the “X” disappeared. I haven’t been able to figure out the setting or combination of settings that will make Cubase display the “X” to mute a segment.
The X and other tools appear when Segments is selected, not Pitch and Warp. Is that, perhaps, the problem? Also, make sure you are zoomed in far enough to see the segments.