= document.getElementsByClasseName("listParagraph" );
                  
                  
                  getElems = Array.from(getElems);
                  
                  
                  getElems.style.visibility = "hidden " ;
                  
                  
                
If this was copy and pasted, there is a typo on getElementsByClassName. Also, you need to iterate through the array of elements and change the style for each one.
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