if the size of the store is not large, it is ok.

the restaurant manager is usually responsible for the overall management of the restaurant, including staff scheduling, supply chain management, finance and so on, while the cashier is mainly responsible for customer checkout and cash management and other related work. There is a certain overlap between the manager and the cashier in their work. If the size of the store is not very large, the restaurant manager can replace the cashier. Many self-operated restaurants do this in order to save costs, but if the restaurant is large, it may be too busy, so a special cashier is needed.