Help (from the small icon near the min, max, and close widgets) just has big text that says "Desktop Effects" in each tab, no matter what you click. Reproducible: Always
Created attachment 85774 [details] Shows odd text
That module has been rewritten but that problem persists (and is arguably worse)
Ftr, the new kcms have actually no WhatsThis property at all, seems to be unconditionally hinted by the kcm shell. Neither have kwinactions, kwinscreenedges, kwintabbox, kwindecoration or kwinscripts such hints. kwinoptions, kwinrules & desktop have as breaindead whatsthis tips as the old compositing kcm, I assume it's "implied" by the kcm and the no-information text was added since there's not much to tell on top and the entire "WhatsThis" concept is a major UX failure. I also looked up random other kcms and there're three types: - no hints - breanded global tooltip (what you can do in this kcm) - basically they repeat the UI elements label and then repeat the repitition in other wording m( I vote for "Fixed by removing no-info WhatsThis labels" If something needs extra information, that information should be in context (tooltip or visible/autohiding label) and not some point 'n click adventure game (though I really liked them, but rather because they were funny ;-)
>I vote for "Fixed by removing no-info WhatsThis labels" ++
If we remove the WhatsThis feature we should do it for every dialog. Even the decoration must not offer the option. On the other hand, the WhatsThis is quite helpful for touch screens where you don't have mouse over tooltips (at best with an infobutton near the control). So why don't we use the tooltip content for the WhatThis text? Oups, there isn't any hint set yet. That's a major usability flaw!
Technically WhatsThis feature is hardly supported by any window manager. It's a KDE specific addition to the NETWM spec and might only work with KWin. Just that is reason enough to give it a kick (run your KDE application in GNOME and you cannot access the help)
The KCM is QtQuick now, and QtQuick doesn't support the WhatsThis feature. Sorry. +1 for removing the whole feature altogether some day.