When defining configuration on SE7300 part no, your choice is between "0" (override) and "5" (possibility to change between °C and °F in interface).
Field Devices, SmartStruxure Lite
its not possible to have both override and °C/°F feature
When defining the part number, you will have to choose. The override feature is usually the preferred choice in industrial applications, while the °C/°F feature is used for Hotels and similar, where users are given the possibility to change unit of desired temperature.