If you created an application in Oracle Visual Builder 19.1.3 or earlier that used the example Oracle SaaS R13 theme you will encounter a compatibility problem when you move the application to run on top of Oracle Visual Builder runtime 19.3.1, and above, where pop up dialogs do not behave correctly. This is due to a slight change in the underlying Oracle JET theming used with the newer version. Fortunately this is simple to fix and here are the steps.
Step 1: Download the updated version of the theme files from GITHub
Step 2: Open your Application, expand the WebApp in question and right mouse click on the resources node. Choose the Import option and select the zip file you have downloaded, then press the Import button.
Make sure you are importing into the /resources top level folder as shown here.
Step 3: Select the application in the navigator and open its Application Settings panel. In the Theme select list, select the new 2.0.0 theme as shown here:
And that's it. You will have successfully upgraded to a 19.3.1 compatible version of the R13 Theme.