Protected apps

Hi, I’m new here.
I want to protect some applications and I entered a pin and also a pattern for it. The thing is that I don’t want to use the pattern, just unlock the apps with my fingerprint, but since I entered the pattern, I can not deactivate it (the pattern)
Is there a way to unlock the apps just with the fingerprint?
How do I remove the pattern?
How do I set avast to default so I can start over configurating it?
Ty in advance

Hi, post/ask here: https://forum.avast.com/index.php?board=66.0