YouTube is testing new mobile gesture controls that allow users to scroll through recommended long-form content in full-screen mode, instead of using Picture-in-Picture (PIP) mode or returning to portrait orientation. This change is only available to a select group of users and aims to enhance viewer engagement, similar to the earlier introduced "jump ahead" feature, which helps users skip to compelling video segments. However, the new gesture modifications have not been well-received by some users who preferred the previous functionality.