To choose the position of certain products in the POS application. i.e. if you want to have the most common items first in the application, you have to the give the items their sorting weight.
To give products sorting weight follow these steps:
Note: the lower the sorting weight, the higher the product appears in your POS application and vice versa. So a product that has the sorting weight -4 will appear higher than a product that has the sorting weight -1 and a product that has the sorting weight 3 will appear higher than a product that has the sorting weight 7, for example.