(“Operations”): Choose Create a database.
(“Database Templates”): Choose New Database.
(“Database Identification”): Enter (for example) eXchange
(“Database Features”): Deselect all checkboxes and reply Yes to all prompts.
(“Database Connection Options”): Choose Dedicated [...].
(“Initialization Parameters”): Keep all values unchanged.
(“Database Storage”): Under Datafiles, click \{DB_Name}\undotbs01.dbf (the fifth entry). In the General tab, reduce File Size from 200 to 100.
(“Creation Options”): Choose Create Database, and then click Finish.