MultiHub Forum

I'm a community manager for a professional networking platform geared toward freelancers, and we're seeing a rise in heated, unproductive debates in our discussion forums that often devolve into personal attacks. Our current code of conduct is very broad, and I want to develop a more specific resource on professional online etiquette for our users. For others who manage professional or semi-professional communities, what core principles have you found most effective to communicate? How do you address subtle issues like tone-policing, derailing threads with whataboutism, or the appropriate use of direct messages versus public replies, and what's the best way to frame these guidelines as tools for better collaboration rather than just a list of punitive rules?