When you are working with SAS Enterprise Guide and you open data, additional libraries might be created. These libraries follow the naming convention ECl0000x and are listed under the server context Libraries icon as shown below:

Cause
These libraries are created when you open data directly on the server's file system using one of the following methods:
When accessing data via these methods, SAS Enterprise Guide creates the ECl0000x libraries in order to provide a method of referencing the data using a libref. The ECl0000x libraries cannot be hidden or removed while utilizing data loaded into SAS Enterprise Guide via the above methods.
To prevent the ECl0000x libraries from appearing, issue a LIBNAME statement to the directory in which the data exists.