is there a quicker way to turn off location on iphone?

depends why you want it off. if it's about people seeing where you are, that's a different switch: Find My app > Me > Share My Location. one toggle, nobody you share with can see you any more, and maps and weather keep working.

Settings > Privacy & Security > Location Services, and the switch at the top turns it off for everything. Not that I know of for a quicker one, there's no one-tap location button in Control Centre. But do you really want it all off? Maps, Find My and weather stop working properly. Scrolling down that same screen and setting individual apps to Never or While Using is usually the better fix. Also, airplane mode doesn't switch off GPS, in case that's what you were relying on.