Tips on Customizing User Registration & Membership – Custom Registration Form, Login Form, and User Profile

How to Hide User Registration Admin Menus

function plt_hide_user_registration_menus() {
	//Hide "User Registration".
	remove_menu_page('user-registration');
	//Hide "User Registration → Dashboard".
	remove_submenu_page('user-registration', 'user-registration-dashboard');
	//Hide "User Registration → All Forms".
	remove_submenu_page('user-registration', 'user-registration');
	//Hide "User Registration → Add New".
	remove_submenu_page('user-registration', 'add-new-registration');
	//Hide "User Registration → Settings".
	remove_submenu_page('user-registration', 'user-registration-settings');
	//Hide "User Registration → Tools".
	remove_submenu_page('user-registration', 'user-registration-status');
	//Hide "User Registration → Extensions".
	remove_submenu_page('user-registration', 'user-registration-addons');
	//Hide "User Registration → Upgrade to Pro".
	remove_submenu_page('user-registration', 'https://wpuserregistration.com/pricing/?utm_source=ur-submenu&utm_medium=upgrade-link&utm_campaign=lite-version');
}

add_action('admin_menu', 'plt_hide_user_registration_menus', 81);

Where do I put this code?

How to Hide the "User Registration Activity" Dashboard Widget

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

	//Remove the "User Registration Activity" widget.
	remove_meta_box('user_registration_dashboard_status', 'dashboard', 'normal');
}

add_action('wp_dashboard_setup', 'plt_hide_user_registration_dashboard_widgets', 20);