You may have a very specific use case that cannot be built with standard SAP Fiori elements floorplans and the extension capabilities of the programming model. In this case, we still recommend creating your app as an SAP Fiori elements app.
You can generate your app using the app generator by selecting the Custom Page template. The app generator creates a custom app that runs on the SAP Fiori elements framework and all pages are treated as custom pages. Under the hood, the custom page building block is used for a custom page. This approach lets you use building blocks, controller extensions, and SAP Fiori tools in your custom application.
You can explore the custom page building block using Custom Page in SAP Fiori Development Portal
