Can I change the default setting from heading to body?

Thanks for providing those details. That definitely helps. 

You can change the formatting of the heading in a note. To learn how, please check out the steps under ‘Create and format a new note’ from the following article:

Write notes on iPhone

You can also change the default style for the first line in all new notes. To do this, go to Settings > Notes > New Notes Start With.

Take care.

Hey there Brixenivy,

Thanks for reaching out to Apple Support Communities. It looks like no one has responded to your question. Here are a couple things that might help others answer your question:

What app(s) in specific are you wanting to do this on?

What iOS Version are you running in Settings > General > About on your iPhone? 

Get back to us with that info so we can better support you.

Cheers