I've got two lanes of MIDI data.  How do I only show one lane in PRV?  It's currently impossible to edit overlapping midi clips...
 
((And for those who WILL ask why i overlap MIDI clips, the one's velocity needs to increase as the other one decreases, like two audio clips crossfading...))

Hi. This is just a guess. If you change from Comping mode, and use sound on sound instead.
Can you edit both lanes, or does the same happen? 
Not in my studio now.
All the best.

Mute the clips (not the lane) in the track view for the data to hide and enable "Hide Muted Clips" in the PRV View menu.