When System Settings is in icon mode, if I click on "Application Style" in the "Appearance" category, it shifts to the usual interface for changing settings: a list of subsections in a pane at left, and the details of a particular subsection in the pane at right.

In this particular section ("Application Style"), there are three subsections at left: "Widget Style", "Window Decorations", and "GNOME Application Style (GTK)". The window title is currently "Widget Style - System Settings". Even though I'm in the section "Application Style", that string does not appear anywhere in the window. As such, it's rather easy to get confused about which section I'm in.

It would be helpful if the window title perhaps showed a breadcrumb-style path ("Application Style > Widget Style") or even just the top-level section. Or perhaps at the top of the subsection frame, it could say which section this is or provide a breadcrumb. When going through and trying to find various settings, jumping around from section to section, it's very easy to get lost or confused about which setting was in which section. Especially because they changed so radically between KDE 4 and 5, and there are many conceptually similar settings scattered around various settings sections: how windows look is affected by the sections Workspace Theme, Color, Application Style, each of which have several subsections.

This isn't an issue in tree mode, since you can always see the tree path to whatever section you're in, but it would be nice if icon mode similarly always provided a complete reckoning of what section you're currently in, and how you got there.