@FilterFreq The user is talking about the scrollbar that is incorrectly displayed in front of the channels, not about the visibility zones…
This issue is in the wiki list already.
This happens when the channels almost fill the entire MixConsole space, but not enough for needing a scrollbar, or even when there’s only a few channels.
One workaround is to tweak the channels width with the buttons, but apparently it returns the next time you open the MixConsole. The only way to get rid of this bug is to make the real functional scrollbar appear.
Here, have a look :