[Plugin: Shutter Reloaded] keep my menu working when shutter displays a big image

Hi
I am trying to make shutter to open only on a part of the screen… because when a big image is displayed, i want to keep use of my menu which is behind. I put a transparent background so now I see the menu ( my image takes only 600×600 px) but it won’t work until i click on the image and close shutter.
Thanx for your help !!!

https://www.ads-software.com/extend/plugins/shutter-reloaded/