bp_modify_page_title( string $title = '', string $sep = '»', string $seplocation = 'right' )

function bp_modify_page_title( $title = '', $sep = '»', $seplocation = 'right' ) {
	global $paged, $page, $_wp_theme_features;

	// Get the BuddyPress title parts.
	$bp_title_parts = bp_get_title_parts( $seplocation );

	// If not set, simply return the original title.
	if ( ! $bp_title_parts ) {
		return $title;
	}

	// Get the blog name, so we can check if the original $title included it.
	$blogname = get_bloginfo( 'name', 'display' );

	/**
	 * Are we going to fake 'title-tag' theme functionality?
	 *
	 * @link https://buddypress.trac.wordpress.org/ticket/6107
	 * @see wp_title()
	 */
	$title_tag_compatibility = (bool) ( ! empty( $_wp_theme_features['title-tag'] ) || ( $blogname && strstr( $title, $blogname ) ) );

	// Append the site title to title parts if theme supports title tag.
	if ( true === $title_tag_compatibility ) {
		$bp_title_parts['site'] = $blogname;

		if ( ( $paged >= 2 || $page >= 2 ) && ! is_404() && ! bp_is_single_activity() ) {
			$bp_title_parts['page'] = sprintf( __( 'Page %s', 'buddyboss' ), max( $paged, $page ) );
		}
	}

	// Pad the separator with 1 space on each side.
	$prefix = str_pad( $sep, strlen( $sep ) + 2, ' ', STR_PAD_BOTH );

	// Join the parts together.
	$new_title = join( $prefix, array_filter( $bp_title_parts ) );

	// Append the prefix for pre `title-tag` compatibility.
	if ( false === $title_tag_compatibility ) {
		$new_title = $new_title . $prefix;
	}

	/**
	 * Filters the older 'wp_title' page title for BuddyPress pages.
	 *
	 * @since BuddyPress 1.5.0
	 *
	 * @param string $new_title   The BuddyPress page title.
	 * @param string $title       The original WordPress page title.
	 * @param string $sep         The title parts separator.
	 * @param string $seplocation Location of the separator (left or right).
	 */
	return apply_filters( 'bp_modify_page_title', $new_title, $title, $sep, $seplocation );
}