Disable WiFi power saving on Pop!_OS 20.04

sudo gedit /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf
[connection] wifi.powersave = 3

Change the powersave value from 3 to 2, to disable WiFi power management.
wifi.powersave = 2

After saving the file run sudo systemctl restart NetworkManager

Here are the possible values for Power Save

(0): use the default value
(1): don't touch existing setting
(2): disable powersave
(3): enable powersave

sudo su