Stock android on the Pixel’s have just an “Internet” button which controls both wifi and mobile data. You can press it, then it will show toggles for wifi, mobile data.

So, scrolling past marks the posts as “read” but that won’t hide them. The way I do it is to use the “hide read” button in the more options menu where the settings button lives. Alternatively you can use that other setting to automatically hide all read posts, but I can’t find that setting either…