By default the user interface to a set reorder points and reorder in quantity of values is disabled. The user interface to manage these values can be enable or disabled at any point from Application Settings screen on the Product tab.
The checkbox "Use std reorder point and quantity fields" enables or disables the standard reorder point and standard reorder in quantity of fields. These fields allowing setting a single value for each product that applies to all location
The checkbox "Use per location reorder point and quantity fields" enables or disables the fields that allow setting reorder points and reorder in quantity of values for each product that are different at each location.