Hi @Yuhao Li 

Keep the LazyDropdownSearch inside a container of accordion and add a class to the container as shown below . Also, please find attached oml for your reference -

CSS :

.ddl-search-inside-accordian{   

 text-align: left;    

display: inline-block;    

margin: 0;  

  padding: 0px 4px 0px 0px;   

 list-style: none;    

position: absolute;    

width: 70%;    

top: 25px;

}