It is completely empty!
Please sow as you see how to work with your template, for example, using Phpshorm, do you have Github? Where can I read the hooks?
~/wp-content/themes/pro-child/functions.php
<?php
// =============================================================================
// FUNCTIONS.PHP
// -----------------------------------------------------------------------------
// Overwrite or add your own custom functions to Pro in this file.
// =============================================================================
// =============================================================================
// TABLE OF CONTENTS
// -----------------------------------------------------------------------------
// 01. Enqueue Parent Stylesheet
// 02. Additional Functions
// =============================================================================
// Enqueue Parent Stylesheet
// =============================================================================
add_filter( 'x_enqueue_parent_stylesheet', '__return_true' );
// Additional Functions
// =============================================================================