How to Hide Melapress File Monitor Admin Menus

function plt_hide_website_file_changes_monitor_menus() {
	//Hide "File Monitoring".
	remove_menu_page('file-monitor-admin');
	//Hide "File Monitoring → File Monitoring".
	remove_submenu_page('file-monitor-admin', 'file-monitor-admin');
	//Hide "File Monitoring → Settings".
	remove_submenu_page('file-monitor-admin', 'file-monitor-settings');
	//Hide "File Monitoring → Help & Contact Us".
	remove_submenu_page('file-monitor-admin', 'file-monitor-help');
}

add_action('admin_menu', 'plt_hide_website_file_changes_monitor_menus', 101);

Where do I put this code?