What I did: I tried to create a new event in Agenda. In the calendar view, I selected the calendar icon (the one that’s on top of the list), I selected a date (or a data range), clicked on the + button and choose New Event.
What happened: the calendar window closes, and that’s it.
What I expected: I would expect another window with some questions about the event I want to create.
Things that might be helpful to know (Agenda version, OS and model, etc): Agenda 6.0 Premium, OSX Mojave 10.14.5, MacBook Pro 2018