I had raised SR for this and following is the update
As you are in 188.8.131.52 we would not be able to achieve this as this feature is incorporated in to the product from 12.1.1
Please go through the following note
How to Remove the Browse Catalog Box on the Learner Home Page ? [ID 423420.1]
It is currently not possible to hide the Browse Catalog section on the Learner Home page.
An enhancement request has been raised under Bug 5388034 - ER: NEED TO REMOVE THE BROWSE CATALOG REGION ON THE RIGHT OF THE LEARNER HOME
If you are interested in this Enhancement Request, thanks to let us know by providing us with your feedback.