What Project type you are using?
If you created a Generic one during your trial period, that is supported only by the Enterprise version, so you have to use Web, API/Webservice, Desktop or Mobile type with the free version.
Well … check also your various katalon / project settings, perhaps you have something checked which is available only for enterprise …
If you start with a fresh new project, same happens?
Would you mind sending us a video reproducing the issue or the project you’re using for better investigation. You can submit them via my inbox for security purposes.