I can’t delete note on Mac

I can’t delete note on my Agenda (version 4.0) in Mac OS.
I tried to use “edit” command on menu and the command using the right mouse button but nothing happens.

You can either select Delete Note from the cog wheel of a selected note or use Option/Alt-Command-Backspace. The Edit > Delete option also works, but only if you are not actively editing the selected note.