Yeah, you’re not right lol. Don’t be so smug; just because people play on console doesn’t mean that they’re so dumb that they can’t figure out how to scroll through text. This is a UI problem on blizzard’s end, not a problem with console players.
Typically R2 is how you scroll down, sometimes it’s the right stick. However, nothing works. Can confirm that as of July 2019, this list only shows the top section and there’s no way to scroll. The other comment suggesting R1/L1 is also wrong – just from looking at the picture you can clearly see that it’s to navigate tabs.
I play both on PC and PS4, there’s several things missing on the console UI… such as not being able to scroll the list of sets needed for this conquest. Or, not being able to see your gold streak for the Avarice conquest, though that’s pretty minimal.