Make Design View available for x64 target platforms with custom elements
Design view is unavailable for x64 and ARM target platforms when the document contains custom elements (XAML with a user control, for example).
WOW what a HUGE bummer to come across this limitation. We had decided recently to try and simplify our team's life by only compiling x64 since we only allow our software to be deployed on x64. However at each turn we found the tool set not fully x64 aware. This was the last straw, and we are going back to "Any CPU" - despite the fact that some of our code is x64 required and thus is not really "Any CPU" :-(
Michael Nicolella commented
Yes please. I'm only interested in developing x64 apps, and it's very inconvenient to need to switch to x86 to see the designer, then to x64 to build + run