Just for your interest, have a look at my recent post: Katalon-IDEA-Combination
Katalon Studio v9.x once brought the “Keywords” to be an Enterprise feature. Katalon disallowed the users of Free version to create and to use any custom Groovy class. It was a surprise for me. Later in v10.0 they changed the feature back. Now that I have got the experience of Katalon-IDEA-Combination, I would not be surprised even if the “Keywords” is priced again in future Katalon v11.x and later. The “Keywords” feature doesn’t really matter to me.