Apple has been rolling out the Apple TV app to various platforms, including smart TVs, gaming consoles and third-party streaming devices like Amazon Fire Stick or Roku. This time, the company has started rolling out the "Apple TV+" app for older LG TVs with the webOS operating system.
The standard Apple TV app is available on LG TVs with webOS 2018 and newer. The new Apple TV+ app is specifically for 2016 and 2017 models.
Although the name and logo are different, the actual app interface is identical to the TV app - except that you can only watch TV+ author content. The "Watch Now" and other iTunes Store tabs are simply missing.
So there are only three tabs in the top navigation section of the app - Apple TV+, Search, and Settings. This also means that the Up Next feature, which used to be on the Watch Now tab, is now awkwardly located as a row at the top of the TV+ page.
Source: lg, @Bartewski