Can not delete my archives from the sidebar. Can not edit as widget.

I have a theme setup on my site and a few widgets, but the site will not let me delete the archives from the sidebar, it will not let me delete it. I want to delete it and replace it with a dropdown instead. The strange thing is I placed the dropdown after the archives, but I can not actually delete the actual block. I am using the Structr theme. Any help would be great thanks.

 

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