Hi Katherine,
There are 3 options to achieve it.
1. Either rename the Priority sym values to whatever you required then it will display automatically.
2. You can add new field in the detail form as readonlytext use the attribute value as priority.description. as soon as the form will get saved the value will get displayed.
3. Dynamically change the values of any field like above priority.description based on onchange event priority. You can also use to have default argspriority description value on load.
Thanks
Mm