Mobile menu dropdown something on the side

Hi, being relatively new, still working a lot by trial and error. On the page ‘alle testimonials’ in the mobile landscape, there is a second nav menu on the left. When that is opened, there is kind of a fat grey border on the right and below. I checked every element quite a few times now, but I can not figure out where this comes from. I also would like to change the position of the dropdown to the left, but when I try that, text gets cut off. I could not find enough in help section on the right way to approach making those menus.


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