Find zoom and change it to the key you want. If it still doesn't work, go to control settings and then to miscellaneous.
It's just Cor if it dosen't, work try Ctrl. Actually, for most new optifine users, in 1. If you want to rebind it, click on the key next to the 'Zoom' and press the key you want to rebind it to. Now you can see what key is bound for zooming.
I have tried all f keys and I have tried looking at controls. In Optifine minecraftI want to know how to zoom in. Arqade is a question and answer site for passionate videogamers on all platforms.