Re: "How can I change my iPhone Calendar format?"
Apple Support has articles online (link below) that may be helpful:
(NB: Article and. info. below is for iOS 17,
else, if you have upgraded your iOS version, please view articles and choose iOS 18 at the top of articles)
In the Calendar app , you can view one day, a week, a month, or a year at a time, or view a list of upcoming events.
If you want, you can: Change how you view events in Calendar on iPhone - Apple Support
Eg: article says:
To change your view of Calendar, do any of the following:
- Zoom in or out: Tap a year, month, or day to zoom in or out on your calendar.
In Week or Day view, pinch to zoom in or out.
- View a weekly calendar: In Day view, rotate iPhone sideways.
- View a list of events: In Month view, tap to see the day’s events. (Tap again to return to Month view.)
Also: You may want to see how to: Change calendar and event settings on iPhone - Apple Support