What is the proper/best way to have multiple add_filter for wp-job-manager-resume

by

Perhaps I’m missing something in your question, but just move the line from one function to the other…

function custom_submit_resume_form_fields( $fields ) {

    $fields['resume_fields']['candidate_title']['label'] = "Job Type";
    $fields['resume_fields']['candidate_photo']['label'] = "Profile Image";

    return $fields;
}