To confirm that you have withdrawn from topics, you will need to view your current enrolment in the Student System. If you have withdrawn successfully, the topics should no longer appear in your current enrolment.
If you have not yet withdrawn successfully, see How do I withdraw from topics?
To confirm that you have withdrawn from a course you need to ensure you have successfully withdrawn from all topics. There is no formal process to withdraw from a course of study. After one academic year has passed without any enrolment, your student status will switch from ‘Admitted’ to ‘AWOL’ (absent without leave). No further action is required.
See How do I withdraw from my course?
If you wish to take a break and return to your course of study in the future, see Can I take time off from study and how do I apply?