Do you strictly need to build the solution on ArcGIS Engine? The reason I am asking is because ArcGIS Engine (a 32-bit application) is on its last release, with no further roadmap ahead. Esri Support ArcGIS Engine 10.8 (10.8.1). To create a custom ArcGIS Pro UI and user experience for your organization, I would suggest to try ArcGIS Pro SDK. If you are planning to create a native desktop application, I would suggest to work with ArcGIS Runtime API for .NET | ArcGIS Developer. You could explore the samples/tutorial from the product links given above.
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