In steps:
Go to the desired program;
In the program "design" section;
Choose the session to delete and click on the X located to the right of the title;
Confirm the deletion.
⚠️ Warning! The deletion is permanent for this program.
(If a copy exists in another program, it will not be affected)
Further information
To learn more about the design stage of a program, click here;
To clone a session, click here;
To change the name of a session, click here.