Google Assistant is not working when hold down the Home Button

[MELBIN MATHAI]

I am a new user of Android. I got my Nokia 6 recently. After got my mobile, I was installed Cortana. That time some default settings are changed. means, if I hold the home button, Cortana is loding instead of Google Assistant. Now I am uninstalled Cortana. But now, if I hold the home button, Google Assistant is not open. I don't know how to make Google Assistant back. Please help me.

Thank you.

 

[Ben P1]

Did you know that Google and Microsoft don't match just like Apple and Microsoft download the Google app and you can turn it on in there but you have to sign in first to activate it