Location of COMPUTERS icon for Apple TV
So, after this latest update to Apple TV software to include the new TV app, my COMPUTERS icon disappeared. I was no longer able to access my iTunes Library via home sharing. After several phone transfers with Apple Support and some self-digging, I found it!
The COMPUTERS icon was buried at the very bottom row of all the Apple TV apps. Click and hold to move the app back up to the top.
Hope this helps.