Dollar Tree review: manager

I was at the Dollar Tree Jan 2, 2019. I was in the line and the manager just closes her drawer and walks out the door. I saw the other cashier ask her where she was headed and she just kept on going. I then overheard the cashier say she was alone in the building. I was shocked at the way the manager just left us in line like that and how she left her staff alone, completely alone. I like coming to this store but the managers need to shape up...very unprofessional and I am quite sure against company policy at the least to walk out of the door. I used to be a manager before I retired from that career and I know that is not how you run a business. Something needs to change. Thank you.