The “Controls” function is designed to control smart devices in the “Smart Home” system (Google Home).
You can control music and video playback on Chromecast devices, which are TVs and smart speakers with built-in Chromecast technology. Management is carried out through notifications.
You can enable this option on your phone here: Settings> Google> Controls.
For more “fine-tuning” settings and device management, install the Google Home app from the Play Store. It supports more than 4000 devices from various manufacturers: TVs, thermostats, lamps, smart speakers and music players, refrigerators, washing machines, and other household appliances.
To view available or connected devices, to disconnect, go to Settings> Google> Devices. Select an available device, in the upper right corner, click on the ellipsis, “Device Information”. Then turn off the remote control (your phone) using the “Broadcast control” switch (Off position).