If you scroll across the top menus to where it says TV then you will only have to look around 4 or 5 rows down to find the 4K Tv stuff.this is how mine looks when it 1st loads
then just keep going down past all this:
featured
included with prime
watch next
featured chan
rent or buy
included with prime movies
pop movies
tv
buy: recent tv
buy movies
included with prime more like
recently added
prime originals
doc
rent or buy
top tv picks
buy recommended tv
included with prime: TV Genres
You are now at HDR
====prime 4K ultra-hd tv=====