B4J Question a WYSIWYG Form not appear after open internal designer

Study B4J : after project setup , use new, MyFirstProgram, set the package name, set the form size in Main page, when create the layout from toolbar designer, open internal designer only get Mainpage-MyFirstProgram visual Designer, have not get a WYSIWYG Form like the "Getting started" guide page, try to connect , no reaction, what is problem?
question ask in 25/10/2024