Description

Is there any way to remove the description box?

the description box is a control of the executeable you use. These executeables are stored in the Directory "contrib\UIs"

Load them in a resource hacker and edit the dialog 104 where the control is stored. Otherwise use the following code

!define MUI_UI_NODESCRIPTION

when using ModernUI.

Only the Modern UI has a description box, so you should use !define MUI_UI_NODESCRIPTION