The feature works exactly in Android 11 Developer Preview 4.
The fact that an extended power menu may appear in Android became known even during the release of beta versions of Android 10. Then an animation was discovered that demonstrated the ability to access Google Pay cards. However, in Android 10, such functionality did not appear.
Already with the release of firmware for Android 11 developers, a topic with an expanded power menu again surfaced. Moreover, it became known that the menu will not only have access to Google Pay, but it will also be possible to control smart home devices. Today it became known that this functionality was seen by one of the users of Android 11 Developer Preview 4, and it turned out that everyone who needs it, whose smartphone is running Android 11, can activate it.
In order for the extended power menu to work, you need to have the latest version of the Google Home application installed on your Pixel smartphone – 126.96.36.199. You can download it from here. Colleagues from the resource Android Police They say that everything definitely works on the Pixel with Android 11 Developer Preview 4 installed. It is likely that the menu will work on other Android 11 firmware as well. But on Android 10, after installing the Google Home update, nothing appears.
However, so far not all smart devices respond correctly to commands from the power menu. But that's the firmware for developers to catch and fix bugs before releasing a stable version of the operating system.
Source: Android Police