No Canvas orDropdownon small screens

Hi
there is no Canvas or Dropdown icon when using on tablets, mobiles or small screens. Where is it gone?

Website Link

thanks for help

Hi, Walter.
Thank you for using our product.
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Hi, Walter.
I'm sorry. I find the cause on your site.
Our module doubles when responsive on your site.
But, the current I still don't find the solution for it.
I think have to custom the module.