I have a new create xamarin android app first i used blank app, and the problem is the main.axml or activity_main.axml did not display any preview. and when i try to create using xamarin.form try to open the tabbar.axml or toolbar.axml it still have no display preview only plain white background and when I click in the middle there is a rectangular blue border show. even when I drag and drop a button, the button is invisible..Note: the difference between xamarin and xamarin.form. xamarin.form have a warning: Custom controls disable. Your project needs to be built before custom controls can be used. This project contains resources that were not compiled successfully, rendering might be affected.
but there is no warning in xamarin..but they have the same issue..I use VS 2017 professional.