Locate drag and drop sidebar file

I have a problem on my site https://www.tblogske.be my sidebar isn’t acting like I want and I can’t locate the code…

I want to put a break behind the standard search widget, but I can’t find where it is located. I searched everywhere for it… it isn’t in the folder of my chosen theme, where I expected it.
I know it is a stupid question but can anybody help me? Thx in advance.

Edit:
Maybe I need to add that I used a widget ready theme, and than I modified the sidebar with the drag and drop system in wordpress.