Hi,
For the select field, you can use the setting disable
to prevent the user from selecting the option and set the default value for the field to save the field value to the database. For example:
[
'name' => __( 'Select', 'your-text-domain' ),
'id' => 'select_67b3inmhfgs',
'type' => 'select',
'options' => [
'a' => __( 'A', 'your-text-domain' ),
1 => __( '1', 'your-text-domain' ),
2 => __( '2', 'your-text-domain' ),
3 => __( '3', 'your-text-domain' ),
],
'std' => 2,
'disabled' => true,
],