Default values

In order to set defaultValues you can follow react-hook-form's API by passing defaultValues as an optional argument to the useForm hook.

Otherwise, since you're already working with fields prop you can pass it to useForm hook in order to set defaultValues as shown below:

const { formProps, methods } = useForm({
    fields: fieldsWithValues,
    getFieldDefaultValue: (field) => field.value,
  });

When using fields you should also provide getFieldDefaultValue function which will be used to set defaultValues for each field.