This issue is related to https://gitlab.gnome.org/GNOME/epiphany/-/issues/1855 As requested, I'm opening up a bug here to track this issue. The scrollbar in Epiphany is interactive in an adaptive touch interface, which is not desirable for mobile web browsing (attempting to interact with web elements on the edge of a small screen causes the view to scroll) and does not match the behavior of other GTK4 applications. I recommend bringing WebKitGTK scrollbar behavior in line with default GTK4 behavior. A touch-only interface should not have an interactive scrollbar.