Hide WordPress admin sidebar in wordpress pages

hide-wp-sidebar.php

<?php
// Fold / unfold the WordPress admin sidebar in certain pages. Set `mfold` to `f`(fold) to close it and `o`(open) to open the sidebar.

add_action('admin_init', 'collapse_admin_sidebar');
function collapse_admin_sidebar(){
		$page = isset( $_GET['page'] ) ? sanitize_text_field( $_GET['page'] ) : false;
		if( $page === "required_page_slug" ){
			if( get_user_setting('mfold') != 'f' ){
				set_user_setting('mfold', 'f');
			}
		}else{
			set_user_setting('mfold', 'o');
		}
}