This gist is used in the tutorial https://www.vijayan.in/how-to-create-custom-table-list-in-wordpress-admin-page

column_space_css.php

<?php
...
/**
 * Fires in head section of admin page
 */
add_action(
	'admin_head',
	function() : void {
		$page = esc_attr( filter_input( INPUT_GET, 'page' ) );
		if ( 'all-drafts' !== $page ) {
			return;
		}

		echo '<style type="text/css">';
		echo '.wp-list-table .column-type { width: 10%; }';
		echo '</style>';
	}
);
...