First, I’m an Avast user and not an Avast Team member.
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I used your comment for a google search (I don’t use ASB) and it returned many hits
This one is from this Community Forum - whilst a little old it is from an Avast Team member.
How do I get rid of the sidebar
The AI Overview in the google search might also help.Avast browser is unusable for me because I can’t completely hide the new right sidebar