QSearch found on my Mac

Avast Free Antivirus / Premium Security
1

I am trying out Avast because I found QSearch app on my MacBook Air. It was messing with my searches. I’ve had Avast almost two months and QSearch is still on my Mac. Why hasn’t it gotten rid of it?

2

Try scan with Malwarebytes for Mac >> https://www.malwarebytes.com/mac/

Why hasn't it gotten rid of it?
Does avast detect it? No security program have 100% detection or zero false positives ....