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Add to functions.php to enable:


// Enable font size & font family selects in the editor
if ( ! function_exists( 'wpex_mce_buttons' ) ) {
    function wpex_mce_buttons( $buttons ) {
        array_unshift( $buttons, 'fontselect' ); // Add Font Select
        array_unshift( $buttons, 'fontsizeselect' ); // Add Font Size Select
        return $buttons;
    }
}
add_filter( 'mce_buttons_2', 'wpex_mce_buttons' );


// Add custom Fonts to the Fonts list
if ( ! function_exists( 'wpex_mce_google_fonts_array' ) ) {
	function wpex_mce_google_fonts_array( $initArray ) {
	    $initArray['font_formats'] = 'Times=times;Typewriter=linowriteregular';
            return $initArray;
	}
}
add_filter( 'tiny_mce_before_init', 'wpex_mce_google_fonts_array' );


// Remove buttons from the mce editor
function myplugin_tinymce_buttons( $buttons ) {
	$remove = array( 'forecolor', 'strikethrough' );
	
	if ( ( $key = array_search( $remove, $buttons ) ) !== false )
	unset( $buttons[$key] );
	return $buttons;
 }
add_filter( 'mce_buttons_2', 'myplugin_tinymce_buttons' );


// Add 'Formats' dropdown to WYSIWYG
function my_mce_buttons_2( $buttons ) {
	array_unshift( $buttons, 'styleselect' );
	return $buttons;
}
add_filter('mce_buttons_2', 'my_mce_buttons_2');


// Add custom styles to 'Formats' dropdown
function my_mce_before_init_insert_formats( $init_array ) {  
	$style_formats = array(  
		// Each array child is a format with it's own settings
		array(  
			'title' => 'Tab Space',  
			'inline' => 'span',  
			'classes' => 'tab-space',
			'wrapper' => false,		
		),  
		array(  
			'title' => 'Blue Block',  
			'block' => 'div',  
			'classes' => 'blue-block',
			'wrapper' => true,
		),
	);  
	$init_array['style_formats'] = json_encode( $style_formats );  	
	return $init_array;  
} 
add_filter( 'tiny_mce_before_init', 'my_mce_before_init_insert_formats' );


// Add a few custom styles to WYSIWYG editor (on admin site)
function wpdocs_theme_add_editor_styles() {
    add_editor_style( 'custom-editor-style.css' );
}
add_action( 'admin_init', 'wpdocs_theme_add_editor_styles' );

* then create a file called 'custom-editor-style.css' in the root of the theme folder