The number of projects is not the problem for you.
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:
Another option for you is to downgrade Katalon Studio to 8.4.x or older, and stay with it in future. You can get previous versions at