FOX News has never been "conservative", nor do they claim to be.
What FOX News has done in the past is to allow the conservative side to be presented which makes them, by current media standards, an "ultra-right wing conservative" network. During the past year, however, their true colors have been showing. While they may still allow the conservative side to be presented, it is only on those issues they choose to cover, and take a look at what they cover: Trump's past; forget Hillary's past--they don't care about that.