ACF Tab Merge

acf-tab-merge.php

<?php
/*
Plugin Name: ACF Tab Merge
Plugin URI: https://enshrined.co.uk/2017/06/14/merging-acf-field-group-tabs/
Description: Merges tabs across field groups in ACF
Version: 1.0.0
Author: enshrined
Author URI: https://enshrined.co.uk
*/

/**
 * Merge Advanced Custom Fields tab groups into a single group.
 */
function merge_acf_tab_groups() {
	$screen = get_current_screen();
	if ( 'post' === $screen->base ) {
		echo '
		<!-- ACF Merge Tabs -->
		<script>		
			acf.add_action("ready", function( $el ){
				var tab_groups = jQuery("#acf_after_title-sortables .acf-postbox:not(.acf-hidden) > .acf-fields > .acf-tab-wrap > .acf-tab-group");
				var tab_wraps = jQuery("#acf_after_title-sortables .acf-postbox:not(.acf-hidden) > .acf-fields > .acf-tab-wrap").parent(".inside");
	
				// Merge the tabs
				if ( tab_groups.length > 1 ) {
				    var firstBox = tab_groups.first();
				    
				    tab_groups.not(firstBox).each(function(){
					    jQuery(this).find("li").appendTo(firstBox);
					    jQuery(this).parent(".acf-tab-wrap").remove();
				    });
				}
				
				// Merge the tab content
				if ( tab_wraps.length > 1 ) {
				    var firstBox = tab_wraps.first();
				    
				    tab_wraps.not(firstBox).each(function(){
					    jQuery(this).children().addClass("hidden-by-tab").appendTo(firstBox);
					    jQuery(this).parents(".acf-postbox").remove();
				    });
				}
			});
		</script>';
	}
}

add_action( 'admin_footer', 'merge_acf_tab_groups' );