Boy this conflicting. The Roku team made their own native app that is light and visually stunning. Unfortunately it is also frustrating to use. Before the app came out I bought the below app. Yes it’s 3mb and the look doesn’t blow your socks off, but it works.
Trying to navigate through Hulu with the official app was a nightmare but the paid third party plowed through the menus and allowed me to easily search with its dedicated search button. If Roku at least made a universal search option I ‘d be happy. That way I could type in a title and then see which channels offers it. Until the native app gets its act together, try the paid app found in the link below.