I don't have any idea what you're all on about, what menu, what drop down. Can someone post a screen shot please?
Note: because I avoid using a mouse, I don't use toolbars, this is what I see in the Plugins menu
If I had to criticise anything it's that I have to work out via elimination where the options come from. IMO the DET options should be grouped in a flyout menu
Aside - one of the reasons I stopped using calibre's library mgt toolbars (without icons even) is that I could never intuit why some buttons had drop downs and others didn't. No need to explain why, I know why, but IMO the rationale is obscure - i.e. non intuitive.
BR