Open it in MediaInfo (free tool) or VLC → look for multiple video tracks or chapters longer than 21 minutes. If it's exactly 20–22 minutes, it's just the episode.
It sounds like you're looking for a specific or special segment related to Young Sheldon Season 2, Episode 15 (" A Birkin Bag for Mother's Day ") in 1080p Web-DL quality. young sheldon s02e15 1080p web-dl