I can't insert sidebar in my site

Hi, I have a problem with my site. I've tried to install a sidebar in my blog section. I chose the right layout (with the sidebar), but when I try to select one of my sidebar, the drop-down menu doesn't open!
Can You help me please?? Thank you. 
(Sorry for my English, I hope you understand)

https://newfairy.it/blog/  this is the page where I have problem with sidebar

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