I think you're referring to the black bar below comments that are too long which can be clicked to expand the comment?
That has nothing to do with KES's collapsible comments feature as someone else brought up. It's a native kbin feature.
KES actually has a feature that addresses this by automatically clicking that bar, but it seems to only apply to thread bodies, not comments, currently. If you're interested in having it apply to comments too, try filing a new issue on Github requesting the feature. The mod in question is "Always expand post bodies" in the Threads category. This should be fairly easy to add.
I know what they mean, because I have the same issue on my work pc (but not at home). I forgot it happens because the personal userstyle I'm using includes CSS to fix this issue entirely.
@speck get yourself Stylus if you don't have it already and try this CSS which works perfectly for me:
Can't guarantee it works with kbin's built in custom CSS functionality, as that one seems to filter out some selectors (no logic behind which).
@shazbot
Basically, what happens without that CSS is that
At no point is the comment ever expanded. When OP says it obscures text, that's just the default state where only x lines of the comment are shown and the bar covers the last line(s). The issue is the comment can't be expanded, so it keeps obscuring the text even when clicked as nothing actually moves.
Looking at the HTML source, I can see five instances of the bar existing at once on the same comment.
I tested just now to turn off my scripts one by one and KES was the culprit. Disabling it fixed the issue. I'll try checking which feature is causing it.