Sample works successfully. I tested with Xamarin Form 4.2.0.x and with latest 22.214.171.1241265
I did reproduce the problem and appears this issue happen when I add other form from UI Essential Kit, if I use only one project compile and work successfully:
-New Solution -> Blank Form (in this point Xamarin Forms Version is 4.2.0.x)
-Essential UI Kit for Xamarin Forms -> I choose OnBoarding and check Walk-through Page -> Add
-In this point I can compile and show up the form correctly
-I updated Xamarin Forms to 126.96.36.1991265
-Compile and run successfully.
-Then Essential UI Kit for Xamarin Forms -> I choose Forms and check Simple Login Page -> Add
-After this if I try to compile I got the error: Error CS0103: The name 'InitializeComponent' does not exist in the current context (CS0103)
Happen the same if I add first Login Page and then OnBoarding
Syncfusion version is 188.8.131.52
Visual Studio for Mac Community (8.3.11).
What can I do?