Plex, you made a change to your UI and ROKU cannot navigate around the screen. Why did you change the UI without informing your users? Why did you not provide a fall back option if your 3rd party partners could not support your change.
FIXED NEEDED:
Provide option for menu list on side as previous. Many do not like the horizontal list at top. Takes up too much screen. You should ALWAYS provide an option for legacy features and you failed.
Provide option to deep hide some libraries that are not easily viewable. Now all libraries are easily accessed at the top of the screen when previously you had to scroll down the veridical list, then click on server and then click some more to get to hidden libraries. Either find a way to hide them more or best case add for 4 digit passcode on user selected libraries so if accessed. .
Next time, do your due diligence. What a colossal failure.