remove-archive-title-prefix.php

function hap_hide_the_archive_title( $title ) {
	// Skip if the site isn't LTR, this is visual, not functional.
	// Should try to work out an elegant solution that works for both directions.
	if ( is_rtl() ) {
		return $title;
	}
	// Split the title into parts so we can wrap them with spans.
	$title_parts = explode( ': ', $title, 2 );
	// Glue it back together again.
	if ( ! empty( $title_parts[1] ) ) {
		$title = wp_kses(
			$title_parts[1],
			array(
				'span' => array(
					'class' => array(),
				),
			)
		);
		$title = '<span class="screen-reader-text">' . esc_html( $title_parts[0] ) . ': </span>' . $title;
	}
	return $title;
}
add_filter( 'get_the_archive_title', 'hap_hide_the_archive_title' );