Why has Fox News taken on a more liberal stance recently?

Recently, Fox News has taken on a more liberal stance (you can Google for many articles, for example “Fox News not supporting Trump).

I just googled and see that Sean Hannity is leaving the network in 2021. https://hillreporter.com/hannity-to-leave-fox-news-partially-due-to-lack-of-trump-support-according-to-new-report-32917

Why do you think this is?