If one has lots of notes-directories and wants to delete them all it's only possible to just delete one by one which is inefficient. If one could mark them all e.g. by STRG+A and delete them in one go would be a good feature.
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There are some plugins for clearing data in Joplin. One is called Victor, which allows you to clear all your data (all notes) with one click:. There are also two others for deleting notes: Joplin Plugins - Delete folder & notes and Joplin Plugins - Delete notes without confirmation
I haven't used them myself, but I understand they might address what you're looking for.