It sounds like you're possibly referring to Do Not Disturb, the older version that existed in iOS 14. And yes, there are differences between DND and Focus, mostly for the better if you take the time to learn how it works.
But, if you want to try to simplify it as much as possible, try this:
Go to Settings>Focus. Tap on each of the Focus profiles (e.g. Driving, Meeting, Sleep, Work) except Do Not Disturb. Go down to the bottom of each one and tap "Delete Focus". That will leave you with just Do Not Disturb. You can turn it on or off right from the Control Center with a tap.