I can't find a way to turn off debuffs, on the FocusTarget, PetTarget, and TargetTargetTarget frames. See the attached image. The FocusTarget frame is circled in the upper left. The TargetTargetTarget frame is circled below and to the right. Debuffs associated with both frames are underlined.
In all cases, the number of debuffs is so large (a whole raid's worth), the display of them runs off the edge of the screen. I would like to simply disable them, but I cannot find any options for doing that (options for disabling *buffs* are available for these frames, and suitable options exists for other frames, but *debuffs* seem to be "hardcoded" ON for these frames).