A code to put in your customizer.php and in your functions.php of the wordpress to order your home and category posts

post_order_customizer.php

<?php

	/**
	The below code goes in customizer.php of your theme
	**/

	/**
	------------------------------------------------------------
	SECTION: Post order on home page and index pages
	------------------------------------------------------------
	**/
	$wp_customize->add_section('section_post_homepage', array(
		'title'		=> esc_html__('Post order', 'mytheme'),
		'priority'	=> 0,
	));

		/**
		Post Order
		**/
		$wp_customize->add_setting('post_order', array(
			'default'     => '',
		));
		$wp_customize->add_control( 'post_order', array(
			'type' 			=> 'select',
			'label'     	=> esc_html__( 'Post Order', 'mytheme' ),
			'description'   => esc_html__( 'Choose the post order on home and index pages', 'mytheme' ),
			'choices' 		=> array(
				'ASC'  		=> esc_html__('Ascending', 'mytheme'),
				'DESC' 		=> esc_html__('Descending', 'mytheme'),
			),
			'section'   	=> 'section_post_homepage',
		));

		/**
		Post Order By
		**/
		$wp_customize->add_setting('post_order_by', array(
			'default'     => '',
		));
		$wp_customize->add_control( 'post_order_by', array(
			'type' 			=> 'select',
			'label'     	=> esc_html__( 'Post Order By', 'mytheme' ),
			'description'   => esc_html__( 'Order posts by on home and index pages', 'mytheme' ),
			'choices' 		=> array(
				'none'  		 => esc_html__('None', 'mytheme'),
				'ID' 		     => esc_html__('ID', 'mytheme'),
				'author' 		 => esc_html__('Author', 'mytheme'),
				'title' 		 => esc_html__('Title', 'mytheme'),
				'name' 		     => esc_html__('Name', 'mytheme'),
				'date' 		     => esc_html__('Date', 'mytheme'),
				'rand' 		     => esc_html__('Rand', 'mytheme'),
				'comment_count'  => esc_html__('Comment count', 'mytheme'),
			),
			'section'   	=> 'section_post_homepage',
		));


	/**
	The below code goes in functions.php of your theme
	**/


/********* Post Order On Home And Index Pages ***********/

add_action( 'pre_get_posts', 'mytheme_order_posts' );

if (!function_exists('mytheme_order_posts')) {
	function mytheme_order_posts( $query ) {
		if ( $query->is_home() OR  $query->is_category()){
			if($query->is_main_query() AND !is_admin() ) {
				$query->set( 'order', get_theme_mod('post_order', 'DESC') );
			}
		}
	}
}

add_action( 'pre_get_posts', 'mytheme_orderby_posts' );

if (!function_exists('mytheme_orderby_posts')) {
	function mytheme_orderby_posts( $query ) {
		if ( $query->is_home() OR  $query->is_category()){
			if($query->is_main_query() AND !is_admin() ) {
				$query->set( 'orderby', get_theme_mod('post_order_by', 'date') );
			}
		}
	}
}