Dollar General review: No face mask enforcement

I visited the Dollar General Market in White House, TN 37188 on 7/25/2020 and saw the sign on the entrance doors that clearly states Mask REQUIRED. However, I saw many customers who were not wearing a face mask. Will you please advise as to how DG plans on enforcing the use of requires face masks? Until they do, I won't be shopping at Dollar General. Thank you.