Why a reboot every time I install a normal rpm?

rustdesk flatpack does not minimize to tray and I do not know how to setup SDDM X11 (as yet). So I have gone down the rpm-ostree install route for the normal fedora rpm on the rustdesk website, but I now have to reboot before it is seen and available to use.
Any TLDR docs that I can read to see why this is?
Thanks.
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Why a reboot every time I install a normal rpm? - Universal Blue