This page ranks quite highly in search results for people looking for networking help on Raspberry Pi. Unfortunately, the steps detailed here are out-of-date as of Feb 2020.
At that point in time, to get Network Manager handling wifi on current Pi OS:
sudo apt update
sudo apt install network-manager network-manager-gnome
/etc/network/interfaces - it should be empty except for an include from
/etc/network/interfaces.d. Now edit
/etc/dhcpcd.conf and add:
Restart, and you should have Network Manager in your menu bar, handling the wifi interface.
I've a few more details of what I did to make this work in this gist, including an alternative approach using a configuration file in
Unfortunately, I can't confirm that any of this still works as I no longer have access to the corporate network which requires Network Manager. But comments on the gist suggest that it's worked for at least some others. Good luck!