How do I go back from transfer to use the iCloud while setting your new phone
How do I go back from transferring my old iPhone to my new one by using the iCloud instead
iPhone XS, iOS 14
Question marked as
See the following from Set up your iPhone, iPad, or iPod touch - Apple Support
If you already set up your new device but want to start over, learn how to erase your iPhone, iPad, or iPod touch.