Sure - follow the steps on this page to get to the singleview for your assignment: https://docs.moodle.org/310/en/Single_view
Then uncheck the box under the "override" column for the student(s) in question
Sure - follow the steps on this page to get to the singleview for your assignment: https://docs.moodle.org/310/en/Single_view
Then uncheck the box under the "override" column for the student(s) in question