Wi-Fi not in Settings

[tzwcfq]

You may be missing drivers for your wireless adapter in sys-net template:

Where to install Wifi driver?

sys-net is an AppVM, which gets its root filesystem from another qube (template qube), Fedora, by default. So whenever you want to introduce changes into the root filesystem you have to do it in the latter qube. This is how Qubes’ isolation works.