iphone

Here you go --> Use Notes on your iPhone, iPad, and iPod touch - Apple Support

Extracted below

"See your notes in Gallery view

• With iOS 13 and later, Gallery view gives you a new way to see your notes — making it easier than ever to find the note you're looking for. Open a folder or list of notes, tap the More button , then tap View as Gallery.

To sort your notes inside of folders:

1. Go to the folder that you want to sort.
2. Tap the More button , then tap Sort Notes By. 
3. Choose how you want to sort your notes.

To sort all of your notes automatically, go to Settings > Notes, and tap Sort Notes By. Then choose how you want to sort your notes."