There isn’t currently a built-in option for copying elements between apps.
You can export the data from an object and use that to recreate the object in another app using an import: Create a New Object.
There isn’t a similar export/import option available for pages and views. Those would need to be recreated manually.
To show your support for the option to copy elements between apps, vote on the feature request here: Copying Object and Page View Settings and Structure To Another App.