Tips on Customizing 3D Viewer – 3D Model Viewer Plugin

How to Hide 3D Viewer Admin Menus

function plt_hide_3d_viewer_menus() {
	//Hide "3D Viewer".
	remove_menu_page('edit.php?post_type=bp3d-model-viewer');
	//Hide "3D Viewer → All 3D Viewers".
	remove_submenu_page('edit.php?post_type=bp3d-model-viewer', 'edit.php?post_type=bp3d-model-viewer');
	//Hide "3D Viewer → Add New".
	remove_submenu_page('edit.php?post_type=bp3d-model-viewer', 'post-new.php?post_type=bp3d-model-viewer');
	//Hide "3D Viewer → Settings".
	remove_submenu_page('edit.php?post_type=bp3d-model-viewer', '3dviewer-settings');
	//Hide "3D Viewer → Help".
	remove_submenu_page('edit.php?post_type=bp3d-model-viewer', 'bp3d-support');
	//Hide "3D Viewer → Affiliation".
	remove_submenu_page('edit.php?post_type=bp3d-model-viewer', '3d-viewer-affiliation');
	//Hide "3D Viewer → Support Forum".
	remove_submenu_page('edit.php?post_type=bp3d-model-viewer', '3d-viewer-wp-support-forum');
	//Hide "3D Viewer → Upgrade".
	remove_submenu_page('edit.php?post_type=bp3d-model-viewer', '3d-viewer-pricing');
}

add_action('admin_menu', 'plt_hide_3d_viewer_menus', 1000000000);

Where do I put this code?

How to Hide the "3D Viewer Settings" Meta Box

function plt_hide_3d_viewer_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "3D Viewer Settings" meta box.
	remove_meta_box('_bp3dimages_', $screen->id, 'advanced');
}

add_action('add_meta_boxes', 'plt_hide_3d_viewer_metaboxes', 20);