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By default, operators are no font locked (to avoid the christmas tree effect). However, you could argue they can be overloaded and it could make sense to highlight all/some of them. It is a perfect example to show you how to customize this minor-mode:
With c++-mode and modern-c++-font-lock-mode enabled, you will see by default:
Add (add-to-list 'modern-c++-operators "=") in your init file to enable extra font locking for operators. Now, = is highlighted:
You do not like some part of the font-locking? Fair enough. Let's disable the syntax highlighting for C++ attributes.
With c++-mode and modern-c++-font-lock-mode enabled, you will see by default:
Add (setq modern-c++-attributes nil) in your init file to disable font locking for C++ attributes. Now, [[maybe_unused]] is no more highlighted:
With modern-c++-literal-string set to t, string literals will be displayed correctly with cc-mode >= 5.33.