Unable to turn off Focus on iPhone

What kind of focus are you referring to? Do you mean stop the camera lens from focusing or turn off a

focus mode you have set?

Why not, what happens when you try? To turn a Focus off, swipe down from the top right of your iPhone to access the Control Center, then tap on the Focus to turn off. You can also turn a Focus off the easier way, which is just to tell Siri: “Turn Focus off.”