Refresh a project
Go to Project > Refresh from the main menu.
Clean up a project
Select Clean... under the File menu.
These temporary files are stored in the following location in your machine:
|Temp's file location
Delete a project
To delete a test project, simply close Katalon Studio and delete the directory on the file system.
In your project folder, if you remove the .prj file, your project is broken and you cannot open this project in Katalon Studio.