Styles the breadcrumb separator in TSF, by decreasing the separator distances from 1ch to 0.5ch.

style-separator-tsf-breadcrumbs.php

<?php
// Don't include the PHP opening tag if PHP is already open.

// From: https://wordpress.org/support/topic/format-space-around-separator-in-breadcrumb/

add_filter(
	'the_seo_framework_breadcrumb_shortcode_css',
	function ( $css, $class ) {

		// Create a reference so we do not have to write the long selector repeatedly.
		$sep_css = &$css[ "nav.$class ol li:not(:last-child)::after" ];

		$sep_css[] = 'margin-inline-end:.5ch';
		$sep_css[] = 'margin-inline-start:.5ch';

		return $css;
	},
	10,
	2,
);