I think you have recently upgraded Katalon Studio to v8.5.x Platform edition.
As of Katalon Studio Platform Edition (V8.5.0) you can not create a new project in Katalon Studio — seriously; I am not joking.
Instead, you have to start with TestOps to create a new project; and then you open the project in Katalon Studio. That’s the way how Katalon team wants you to follow. See the following instruction: