How to restart the network manager applet

You can restart nm-applet with this command from terminal:

killall nm-applet; nohup nm-applet &

or by restarting the network-manager service (which will restart nm-applet):

sudo systemctl restart network-manager

or

sudo service network-manager restart

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A youtube video explaining the answer

If you have gnome, restarting the shell (Alt-F2, r, Return) might do it.