after researching how to get this configured on kali 2020.2, i finally figured it out and thought of sharing it. I was getting tired of typing in my username and password every time when login in, i wanted to be able to quickly choose a username and just type a password. Here is how i did it;
open this file with your favorite txt editor /etc/lightdm/lightdm.conf
and uncomment the line greeter-hide-users=false
step by step
sudo vi /etc/lightdm/lightdm.conf
[enter your password]
once you are in vi editor
immediately type: /greeter-hide-users=false and press enter, then press n to continue searching downwards or N to go upwards until you find the line with just: #greeter-hide-users=false
then press the letter a and hit the backspace/delete to get rid of the # then hit ESC and type :wq
sudo reboot
and the next time you get to the login screen you'll see a drop down account list, like so
kali login.jpg
