About folders in Notes on Mac
Notes automatically includes these folders:
All [account]: Shows notes from all folders in the account (except the Recently Deleted folder). For example, if you use iCloud notes, there’s an All iCloud folder.
Notes: Contains notes that aren’t in folders you created or the Recently Deleted folder.
Recently Deleted: Contains notes you deleted in the last 30 days (either from this Mac or from your devices that have iOS 9 or later or OS X 10.11 or later).
Additionally, you can create your own folders.
Keep in mind the following about moving notes or folders:
If you move notes or folders from one account to another, you might permanently lose formatting and attachments in your notes. For example, sketches might be turned into graphics files that can’t be edited using the sketch editor in Notes on iOS devices.
You can only move or copy locked notes between folders in your iCloud and On My Mac accounts (and you may need to unlock them to do so).
If you’ve added people to a note using your iCloud account, or you’ve been added to a note using your iCloud account, you can only move or copy the note between folders in the same iCloud account.
When you view a folder, by default, the most recently created or changed notes are listed first. You can change the sort order in Notes preferences.
You can also pin your most important notes to the top of the notes list for easy access if you’re using upgraded iCloud notes on macOS High Sierra 10.13 or later.