MMM-rdrDrawingBoard : The drawing board is too large on the screen. HELP!

[Axel51]

Hi,
I’m french. I installed the MMM-rdrDrawingBoard module and it’s OK.
My problem is that the drawing board takes too much place on the screen of the mirror.
If i change the width and the height in the configuration, it changes nothing.
I tried to go inside the source code to modify it but it’s too difficult for me.
I’m sure that it would be easy for someone who knows how to code in JS.
So, who can help me, please?
best regards,
Adel