No, but they could try to stop their algorithm from recommending groups promoting disinformation, conspiracy theories, hate speech, and racial violence.
They could also take efforts to fact-check political ads, or prohibit them entirely as others have done.
The reality is that Facebook is afraid of a reckoning. They're pretty sure that they're going to be under investigation, and likely regulated or broken up, if the democrats win. If the republicans win, they get to continue to be the incredibly profitable right-wing disinformation distribution hub they have been for a while. This gives them little incentive to clean up their act, since that might leave them vulnerable to the consequences of their actions (or inactions).
It's not just about letting people post lies and disinformation from Fox News, it's about Facebook actively herding whoever they can into groups that radicalize people in order to increase their engagement by driving them down a conspiracy theory rabbit hole.