Welcome to the forum.
I concur with the above. MBAM all good. Default settings all good. Scan maybe once a week, becoming less often if nothing (or not much) is ever found. (I scan about once a month, or whenever "symptoms" happen. Which has not been for a long time.)
It's a good idea to ask about anything Avast (or computers in general) here if you're unsure.
If more folk did as you, maybe half the problems some folk encounter (such as having two AV's) would not occur, so good on you for checking.
Any more questions, just ask away.