Hi all! Some time ago I enabled the "menu in titlebar" functionality of KDE.
Now after some time I find it doesn't suit me, so I'd like to disable it. However, I don't find how to do it!

I have read, in various forums, that I have to go into System Settings => Application Style => Widget Style => Fine Tuning, and I should find there the option to disable it.
I saw some screenshots too, so I know the option should be there, but I do not have it!!

Here is the screenshot of my System Settings:

Can someone help me understand what I'm doing wrong?
Thank you in advance!