The new way to design activity layout in a library needs the way to visualize the activity within the library project.
Much like how the designer panel allows both designing and visualize in C# based libraries (in Visual Studio), the new Activity Layout window for an activity should both allow for customization and visualization.
This will ensure that the developers developing custom libraries in UiPath do not need to consume it in another project just to observe/test how the end result would look like when consumed by a project.
In short, right click on the activity to navigate to Activity Layout and in the window somekind of user interaction to visualize the activity.
