Display only "Welcome, FirstName" when connected

https://www.jfarthing.com/development/theme-my-login/changing-page-titles/

Thanks, I’ll try that soon ??

This function is outdated.
I used it to meet my needs if someone is interested:

function tml_title( $title, $action ) {
	if ( is_user_logged_in() && $action == 'login') {
		$user = wp_get_current_user();
		$title = sprintf( 'Welcome, %s', !empty($user->user_firstname )? $user->user_firstname : $user->user_nicename );
	}
	return $title;
}
add_filter( 'tml_title', 'tml_title', 11, 2 );