Microsoft today pushed an update to Xbox One Preview Program users. The new build offers a feature that users have been asking for: the ability to disable "Hey, Cortana" voice commands.
Disabling Cortana features will allow users to once again use the classic "Xbox" commands. Of course, this will also result in disabling headset support, as well as voice features in UWP apps.
Today's update will also disable Cortana in France, Italy, Germany, and Spain. These regions were only planned to be supported during the preview period. Presumably, the feature will return in the future.
Thanks for helping us test Cortana on Xbox One! We’ve received tons of excellent usage data and feedback, leading to dozens of improvements. While we continue to train Cortana, if you choose to opt out of Cortana, the “Xbox…” legacy voice command will be enabled.
If you choose to opt-out of Cortana, please be aware of the following: 1) Headset voice control support will be disabled. 2) Voice dictation will be disabled. 3) Universal Windows apps voice features will no longer function. Only “Xbox…” legacy voice commands will be recognized.
If you wish to opt-out of Cortana and use the “Xbox…” legacy voice commands, launch the Guide, navigate to All Settings > System > Cortana settings, and flip the first toggle to Off.
At this time we’re also disabling Cortana for France, Italy, Germany, and Spain, as support for these regions was only planned to be available during this preview period. For now, please continue to use and give feedback on the “Xbox…” legacy voice commands in these regions.
The Windows 10 Anniversary Update for the Xbox One is to be broken up into two pieces. The first part is slated to arrive in just three weeks now, so this is crunch time. This is why features that were only supposed to be in the preview period are now being removed.
Source: Xbox Preview Forums (restricted)