Rated 1 out of 5 stars

Not working for v115. It seems to have no effect at all, the many headers are still one per row. Alt+D opens the File menu here (German UI).

This review is for a previous version of the add-on (5.1). 

Please use the provided support email address for bug reports.
Alt+D is a system shortcut in German, it is not used by the add-on.