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How to Hide Meta Ranker Admin Menus

function plt_hide_meta_ranker_menus() {
	//Hide "Meta Ranker".
	remove_menu_page('edit.php?post_type=meta-ranker');
	//Hide "Meta Ranker → All List".
	remove_submenu_page('edit.php?post_type=meta-ranker', 'edit.php?post_type=meta-ranker');
	//Hide "Meta Ranker → Add New".
	remove_submenu_page('edit.php?post_type=meta-ranker', 'post-new.php?post_type=meta-ranker');
	//Hide "Meta Ranker → Votes Log".
	remove_submenu_page('edit.php?post_type=meta-ranker', 'meta-ranker-logs');
	//Hide "Meta Ranker → Quick Setup".
	remove_submenu_page('edit.php?post_type=meta-ranker', 'meta-ranker-settings');
	//Hide "Meta Ranker → About".
	remove_submenu_page('edit.php?post_type=meta-ranker', 'meta-ranker-settings');
	//Hide "Meta Ranker → Copy Styles".
	remove_submenu_page('edit.php?post_type=meta-ranker', 'copy-styles');
}

add_action('admin_menu', 'plt_hide_meta_ranker_menus', 51);

Where do I put this code?

How to Hide the "Plugin Not Activated" Meta Box

function plt_hide_meta_ranker_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "Plugin Not Activated" meta box.
	remove_meta_box('mrv_not_active_notice', $screen->id, 'advanced');
}

add_action('add_meta_boxes', 'plt_hide_meta_ranker_metaboxes', 20);