The F11 key serves two main purposes on a laptop: entering and exiting full-screen mode in most web browsers and applications, and performing a secondary "action key" function (like volume or brightness). How you activate F11 depends entirely on your laptop's keyboard settings.
Look at the small icons on your F11 key. If there is a picture of a speaker, sun, or airplane, that is the default action . You will need the Fn key to get the plain "F11" command. how to f11 on laptop