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In the Eclipse WindowBuilder editor, the Design tab isn’t showing anything

When I create a jframe within a java project it shows me all the code in the Source part but when I go to Design it shows nothing? Would like some help on how to get the whole interface where you customise the GUI.
Screenshot of design page

Screenshot of source page


That’s a known issue of the Eclipse 2020-09 release which is already fixed (see Eclipse bug 567071).

Update to WindowBuilder 1.9.4 either via the Eclipse Marketplace or via Help > Install New Software… and working with the update site