Answer:
Fn + F11 or just F11
Step-by-step explanation:
On a windows PC some keyboards will have a key that say Fn. Fn stands for function. All windows PCs will also have a bar of keys at the top that say F1, F2, F3 all the way upto F12. If you hold down the Fn key and press F11 it will go into full screen. If you don't have an Fn key justpress F11.