Netflix has switched?

I just spilled a drop of tea on my pc and wiped it away with a pillow (while watching netflix) and then it suddenly got smaller (see picture) how do I get rid of it?

Your normal keyboard keys. With programs such as Word or Excel, you can enlarge or reduce the screen by holding down the "CTRL" key and at the same time moving the mouse wheel up (enlarge) or down (reduce).

Try the F11 key

I don't use a mouse because i have a touchpad.