It is all described here below:
how to change the behavior of F3? • KDE Community Forums
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Dolphin has this weird behavior where when you hit F3 on a split view (in order to get back to single view): it closes the view that has the focus.
I want that in that case It closes the other pane (the one that is *not* focused)
I'm already a C developer and desktop Linux user, so wont be a problem solving this one for you, It's a habit of mine making software patches for personal taste, so it's a thing that a have some experience in doing. Th Plus