Folder appearance

Hi, I am not sure where does my suggestion fit better - if into the Plugin idea or feature request.
Anyway, I would welcome some plugin/feature that would show my folders in the sidebar list as folders and not simply as other notes. Although some themes show folders as actual folders (sanctum from the top of my mind), I’d welcome it if this view becomes an optional part of appearance/customization. I am having a hard time differentiating between what is a simple note and what is a folder.