Tips on Customizing DesignSetGo

How to Hide DesignSetGo Admin Menus

function plt_hide_designsetgo_menus() {
	//Hide "DesignSetGo".
	remove_menu_page('designsetgo');
	//Hide "DesignSetGo → Dashboard".
	remove_submenu_page('designsetgo', 'designsetgo');
	//Hide "DesignSetGo → Blocks & Extensions".
	remove_submenu_page('designsetgo', 'designsetgo-blocks');
	//Hide "DesignSetGo → All Submissions".
	remove_submenu_page('designsetgo', 'edit.php?post_type=dsgo_form_submission');
	//Hide "DesignSetGo → Settings".
	remove_submenu_page('designsetgo', 'designsetgo-settings');
}

add_action('admin_menu', 'plt_hide_designsetgo_menus', 1000);

Where do I put this code?

How to Hide DesignSetGo Meta Boxes

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

	//Hide the "Submission Details" meta box.
	remove_meta_box('dsg_submission_details', $screen->id, 'normal');
	//Hide the "Submission Information" meta box.
	remove_meta_box('dsg_submission_meta', $screen->id, 'side');
}

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