Currently, you can only select one folder at a time, which means if you have many folders that must be deleted you must tediously delete them one-by-one (in app, at least.)
Use case or problem
I represent references as folders containing notes on the paper/resource, so when I want to delete multiple resources for whatever reason, I can only do it one at a time.
Another example is when you are building and testing templates that happen to generate folders. If I am testing a template and made changes, I often will have to repeatedly delete folders that it had created so I can see how it generates new folders from the updated template.
Proposed solution
Allow for standard multi-select functionality found in most directory systems, such as CTRL+Click to select multiple folders or selecting one folder followed by a SHIFT+Click of another folder to select all folders in-between.
It would also be nice, if this were implemented, to have a separate* warning dialogue box (that can be disabled) if you are trying to delete more than one folder that contains notes, just to help prevent accidental mass-deletions.
*Separate from the standard single-folder deletion confirmation prompt.
Current workaround (optional)
Right now, you can open File Explorer (windows) and delete them outside of the app, or delete them one-by-one.