Hi ryly137,
Welcome to Apple Support Communities. We understand that you're having an issue with deleting more that one note at a time in the Notes app. We'd like to help.
From what you've shared, we see that what you're searching for are folders. While you can delete multiple notes listed in each folder, you will have to manually delete each folder individually. These steps can help:
Delete files and folders on Mac
At any time, you can get rid of files, folders, and other items that you no longer need. You start by dragging items to the Trash in the Dock, but the items aren’t deleted until you empty the Trash.

You can find more information here: Delete files and folders on Mac - Apple Support
If you'd like to leave feedback about this issue, you can do so here: Product Feedback - Apple
Hope that helps.
Take care!