See this sticky
Common tweaks to a REAPER theme to learn how to unpack a theme. Once unpacked, a theme can still be used but you can swap in images from other themes, or edit images, to make changes.
As mentioned, item_bg_sel.png is the image in question for what you want.
Quote:
Originally Posted by foxAsteria
I think this question belongs in the theming forum.
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Agreed, and done.