PowerApps Group has provided an excellent Phone-Layout 3-Screens CRUD Apps and generate automatically using existing data.
For PC-Tablet Layout, it is yet to be included by PowerApps Group.
Nevertheless, 3-Screens CRUD may NOT be so practical for Big-Screen devices. Hence, I have resorted to making app for PC-Tablet Layout with ONE-SCREEN CRUD, so that it looks neat, faster response, no-navigation and hopefully, with less resources used, the apps will response much more smoothly.
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Sample CRUD-One Page .zip