@Janardhan Jaan
Essentially you need to identify the id of that particular HTML element (right click inspect and dig in to the HTML), and remove it with either vanilla JS or jQuery.
Should be noted this is "a bit hacky" and NS do not guarantee that they will not change field ID's in the future.
You can probably achieve this in a client script page init but as with most things "client script in NS" you may need to fiddle around with it.