Go in the feed or category for which you want to change the view. Tap the three dots on the navigation bar. Select your favorite view. It is the first set of options.
Go in the feed or category for which you want to change the view. Select on of the three layout options on the top right of your screen. Note that you can also change the view of the Home page.
Note that on both mobile and desktop each feed and category can have its own view.