When previewing forms, the Country field displays --Select One-- instead of a default value. Due to not having a value for the Country, the State or Province field may be missing as well.
The country field will typically default to the same country as the school. When the address entered in for the school is not entered or incomplete, this can cause the field do display --Select One-- instead of defaulting to the country the school is located in. To verify/correct this, we will need to perform the following:
Go to Core > School > School & Grade Levels
Click the pencil icon under Main Address to edit it
Ensure the complete address is entered in, including Country