There is a property on selfVM called DisplayMode - that has one of the values

enum DisplayModeEnum { UINormal, UIModal, UIPopup, Technical, RestPost, RestGet, RestPatch, RestPut,RestDelete };

Since ViewModels may have multiple usages it is good to be able to know the current use.

ViewModels used as Templates in transform, DeepClone, ServerSide, SysAsyncTickets, OpenDocument Reports, Tajson etc will all have DisplayMode.Technical.

ViewModels rendering pages as MVC will also have the DisplayMode Technical.

UI in WPF and Turnkey (both AngularJS and Blazor) will set the DisplayMode to one of UINormal, UIMModal, UIPopup