NVIDIA SHIELD Screenshot
Taking a screenshot with the NVIDIA SHIELD in the past was as easy as pressing and holding the home button on the remote/controller and then clicking screenshot. The screenshot feature within the Android 8.0 Oreo update to the NVIDIA SHIELD has been removed. NVIDIA has reportedly come out and said they removed the feature to work on other features.
It really sounds like it’s not coming back. If you’ll still like to screenshot your screen I’d recommend just taking a photo of your screen with your phone its the easiest and quickest method.