The values able to be selected against Primary Category are controlled by a lookup called PrimaryCategory.
This can be found and edited by following the steps below:
Click Admin, then click Lookups.
Select Lookups.
Search for the PrimaryCategory lookup.
Scroll down to Lookup Values and click the plus
icon.To edit an existing value, click the pencil
icon.Remove existing values by clicking the three dot menu
icon and selecting Delete.
Once the values have been set up against the lookup, you can set the value against a record by editing the contact record.
đ Note: Deleting or editing an existing value will not change or remove where it has been used on existing records.