Hello Ray,
In order to display or hide an element on the Ionic app page you can use attribute "ngHide" it is an AngularJS attribute, more details about it you can find in official AngularJS documentation: https://docs.angularjs.org/api/ng/dir...#
Or another way is to use CSS Class directive with "ngClass" - https://docs.angularjs.org/api/ng/dir...