I had a similar experience a few days ago
when the icon wasn’t present while there where no known WLAN’s in the area
and I needed to connect to a new (previously unknown) one.
What did the “trick” for me was:
opening a terminal and issuing: systemctl restart NetworkManager
… the icon came back - and let me choose the network I wanted …
a bit weird, but this was the first and only time this happened - so far
first:
I have no idea why that would suddenly just disappear … for no reason at all …
what you could try is to add it (back) - it may work like this LANG=C xfce4-settings-manager
(the “LANG=C” is so that you see what I see … - all with the same names and in english …)
go to “Session and Startup”
in the second tab (Application Autostart)
there should be: Network (Manage your network connections)
if it isn’t - add it to the panel again
The app is called:
Network Manager Applet - or very similar
and then there is the possibility to connect using a terminal and nmcli - until you figure out how to get the applet back
which disappeared for no apparent reason … apparently …
if that fails:
just pretend this icon and applet was never there
and proceed to add it to the panel
like you would for any other applet that is available but not in the Manjaro default configuration
In Panel Preferences- Items-Status Tray Plugin- Properties(Hamburger Menu to the right of "remove’)
under SysTray Icons, is Network Manager Applet hidden?