One quote from the article (which was written by the Right) says, "Other left-wing and anti-Trump grousing included in a Fox News roundup of reactions came from the Daily Beast — “using his old platform to tell Americans that their two choices for president are both not that different and equally terrible” — and former Rep. Joe Walsh — “boring, tired, not helpful, way too easy of a take.”

When I Googled the word "Grousing", it means to complain pettily. So that was a shot at the Left!

One quote that was used to show off Stewart's welcoming back to the chair: "No, Jon Stewart really wasn’t sitting at his desk at Comedy Central for the last nine years, waiting for someone to turn the lights back on.

Yet it almost felt that way during Stewart’s return to “The Daily Show” Monday night. His signature moves — blunt satire, facial grimaces, incisive use of video and some occasional lectures — were all intact. Public figures are served notice that the media’s sharpest bull detector is back on the job."

They also left this little note at the end, which really makes Stewart look like a good guy, "During his time away, Stewart spent time as an activist fighting to get benefits for Sept. 11, 2001, responders and two years hosting “The Problem with Jon Stewart” on the Apple TV+ streaming service. He made a subtle allusion to the latter on Monday, saying he would be making jokes about China and AI, subjects that reportedly made Apple uncomfortable before axing the show."

I think doing a little research on the author's themselves, and Googling unfamiliar terms, looking closer at the pictures used in news stories are all things to look for when trying to determine bias.