Forums mIRC Help Color of the line between editbox and main window

I've been using mIRC with black backgrounds since forever.

Today mIRC updated from 7.64 to 7.65. After launching, there was suddenly a white line between the editbox and the main window. Before, there was no visible line here.

Is there a way to change the color of this line? Or am I stuck on 7.64 forever now? The white line to the black background is really disturbing.

mIRC 7.64:


mIRC 7.65:
https://i.imgur.com/eLewPnt.jpg

Thanks (=