Google Now on Tap doesn't launch when i press Home Button on BV6000

Hi, guys. My name Tommy and i need help here

Using Blackview 6000 just a week. This device has 3 button on the home screen.
Left is menu button
Middle is Home Button for go to home and recent task when long press
Right is back button

I can't launch Google now and Google now on tap. Because the Home Button is for recent task

So, how can I have my home button for Google now and Google now on tap?

Thanks in advance


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