Fix for a site

file.js

<script>
jQuery( function($) {

  $( document ).on( 'click', '.ld-expand-button', function( event ) {
    // Get the clicked element section cover.
    let $_ParentEl = $(this).closest( '.ld-item-lesson-item' );
    
    // Check if it's the parent expand all.
    if ( $_ParentEl.length < 1 ) { // It's da big one.
	let $_Expanded = $( '.ld-item-list .ld-item-list-item-expanded' ); // trigger all.
       // Determine if it's expanded or collapsed.
	if ( $_Expanded.hasClass( 'cx-ld-is-expanded' )  ) {
		$_Expanded.css({ 'overflow' : 'hidden', 'max-height' : 0 });
		$_Expanded.removeClass( 'cx-ld-is-expanded' );
	} else {
		$_Expanded.css({'overflow' : 'inherit', 'max-height' : 'fit-content' });
		$_Expanded.addClass( 'cx-ld-is-expanded' ); // Add Class to know it's expanded.
	}
	
       return;
    }
    
    // Now trigger the necessary for the clicked item.
    let $_Expanded = $_ParentEl.find( '.ld-item-list-item-expanded' );
	
	// Determine if it's expand or collapse.
	if ( $_Expanded.hasClass( 'cx-ld-is-expanded' )  ) {
		$_Expanded.css({ 'overflow' : 'hidden', 'max-height' : 0 });
		$_Expanded.removeClass( 'cx-ld-is-expanded' );
	} else {
		$_Expanded.css({'overflow' : 'inherit', 'max-height' : 'fit-content' });
		$_Expanded.addClass( 'cx-ld-is-expanded' ); // Add Class to know it's expanded.
	}
	
  });

});
</script>