How to Turn Off “Ok Google” on Your Android Device
Step 1. Press the home button on phone and say OK Google (You can also say Hey Google) the following screen will appear. Then click on the people icon on top right.
Step 2. From the next menu, select the “assistant” tab.
Step 3. Under “assistant devices” click on “phone” to go to the google voice assistant on the device.
Step 4. You can notice that “access with voice match” on your device is enabled. Disable it by clicking on it and ok Google Assistant will get disabled.