There is a software for Windows called "Logitech Options" which can switch media keys to function keys, but this setting is not remembered in keyboard. There are similar cases with other logitech keyboards already with solutions:
- K810 http://www.trial-n-error.de/posts/2012/12/31/logitech-k810-keyboard-configurator/
- K480 https://betoneful.com/tech/logitech-k480-on-ubuntu-and-fn-buttons-default-behaviour/
- K760 How can I make the function keys the default on a Logitech K760 Bluetooh keyboard?
But neither seems to work for K380. Has anyone figured out solution for this keyboard? It probably needs capturing communication between keyboard and Windows software, but it's quite complicated.