Changing the second prompt. :{ modules| No setting available to change.

In order to change the main prompt it's as simple as a single command.

:set prompt "> "

However, in order to change the second prompt, you'd have to go into the ghci source code, and remove code or wrap existing code to add a switch/configuration for it.

Example..

> :{
Prelude| 

As of the reason to having a configurable prompt, when you have many modules, this list can become annoying fast and so many have disabled showing the modules. Yet we can't do this with the second prompt.