Canvas Components Overview - Power Apps

Canvas components make it easier to build reusable controls, such as navigation menus and dialogs. The ‘master’ / ‘instance’ behavior makes it easy to reuse them as building blocks inside the app or shared between apps. By creating a component library, app makers easily share and update one or more components with other makers. Component libraries are containers of component definitions that make it easy to: Discover and search components. Publish updates across environments. Notify app makers of available component updates.