If first check in your header.php file and check in title tag what is print. if in title tag bloginfo then it’s replace with wp_title(”) because bloginfo is not replace with code.
Header.php
<title><?php wp_title(''); ?></title>
After function.php file put this code:
function wpdocs_theme_name_wp_title( $title, $sep ) {
if ( is_feed() ) {
return $title;
}
if ( is_home() || is_front_page() ) {
return $title;
}
global $page, $paged;
// Add the blog name
$title .= bloginfo( 'name' );
// Add a page number if necessary:
if ( ( $paged >= 2 || $page >= 2 ) && ! is_404() ) {
$title .= " $sep " . sprintf( __( 'Page %s', '_s' ), max( $paged, $page ) );
}
return $title;
}
add_filter( 'wp_title', 'wpdocs_theme_name_wp_title', 10, 2 );
NOTE: your title tag is blank then in tab display your SITE URL.