OP, you won’t know whether or not your child skips class, unless his or her performance is below your expectations and skipping is revealed as a source of poor performance. Of course there are legitimate reasons for missing a class once in a while.
I do have the expectation that my daughter attends all of her classes. I expect that going to class and keeping up with schoolwork and studying to be priorities for her. If she could get everything she needs to learn from outside resources or teaching herself, why go to a brick and mortar school at all?