Change the legal definition of corporations? Corporations exist to provide liablity protections to sharholders, which means they are mainly incentivized to externalize costs and avoid liability to maximize profit, or even to make profit in businesses that would not be profitable if they could be held liable for externalized costs (deep sea oil well drilling). Limit the ability of corporations to shield themselves from view through multiple levels of shell corporations and Special Purpose vehicles. These are probably controversial stances on a board about startup culture and breaking the rules to get rich.

Stop voting for people and judges that believe in the Friedman doctrine?

Every decision has tradeoffs. Western society has largely decided to prioritze capital owners over everything else.