Oxygen application style & window decoration in Fedora 35 KDE

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Although it seems to ask about the same topic, this question is different, referring to icons, cursors, even GTK themes.

I am talking about the application style theming, and especially window decoration, not just the panel and widgets theme that is installed by default (under ‘Plasma style’).

I am not sure what the question is here.

Are you asking why you don’t have an option for oxygen? Did you install it?