Change color on my new iMac?

FWIW, menus are tinted by whatever color is underneath them, unless you have "Reduce transparency" enabled in System Preferences > Accessibility > Display. Unless you had some third-party app that would change the menu color that I'm unaware of, there's never been a way to change the menu color.

Drop down menus will either be whitish or grayish depending on the Appearance setting in System Preferences > General. You cannot choose a color.

Is your Mac in dark mode? You can see this under system preferences, general.

My mac is in dark mode and my menus are so dark as yours

Frank, what color are you trying to change? You posted a screen shot about Bookmarks.