I'm having some trouble customizing one key part of my desktop. I frequently work in 2 or more open windows side-by-side or tiled or some other arrangement, often referring to one of the inactive windows. For example if you open 2 explorer panes and drag each to either side of the desktop so they're both filling one half of the screen. Now click on an icon in one pane, see how it's highlighted in blue (or your theme's easily definable colour), then if you click on and make active the other pane that highlight around the icon you just clicked on turns to an extremely light grey... as hard as I search in Control Panel and the Window Color and Appearance settings I can't find a selection box for this colour.
To clarify its the colour of the selection in the inactive window I want to change, not the colour of an active selection.
Thanks in advance!