By default, GNOME disables WIFI notification. This should be permanently set
so that users do not connect to a wireless network when the system finds one.
While useful for mobile devices, this setting should be disabled for all other systems.
To configure the system to disable the WIFI notication, add or set
suppress-wireless-networks-available to true in
/etc/dconf/db/local.d/00-security-settings. For example:
[org/gnome/nm-applet]
suppress-wireless-networks-available=true
Once the settings have been added, add a lock to
/etc/dconf/db/local.d/locks/00-security-settings-lock to prevent user modification.
For example:
/org/gnome/nm-applet/suppress-wireless-networks-available
After the settings have been set, run dconf update.