I'm quite colorblind and can't easily see the orange highlight behind the icon of a selected item in the outliner. I've been all through the themes preferences but the color doesn't seem to come from the outlines sub-panel. I would be very grateful for any guidance.
2 Answers
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The colour in the outliner seems to be linked to the outline colour of the active object in the 3D view.
You can change this colour in User Preferences> Themes> 3D View> Active Object: