I have MATE bionic on another machine. It is running mate-menu.py 18.04.3 (as Advanced Mate Menu). In that version, in preferences, I can change the colors of the menu in a tabs called 'themes' as well as the icon.
In 19.10 I have Advanced menu version 19.10.2 and cannot change the theme, and most importantly there is no option to customize the icon.
I have looked in dconf editor for the option under org>mate>menu-menu , but I don't see an option there either.
Am I missing something or is this feature removed? (The icon and theme customization)
Thanks for the help.