how to close selection by clicking arrow?
Hi Jwkhor 
Which browser are you using?
The select closes normally in google chrome.
hi，I tried using both Edge and Chrome, but I couldn’t close the select option 
This is strange, perhaps you are using the deprecated version of the select element?
i using latest Select(Advanced)
Alright, I’m going to ask you to start a new support chat so your issue can get checked:
Bottom left corner:
Hope you get it solved;
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I believe this is “by design.” Both the single and multiselect (advanced) elements behave this way and rely on on select or clicking outside of the element to close it. I built my own dropdowns a while back, and I think this was one of the design decisions I aimed to control.
edit: it looks like the non-(advanced) select element has fixed this.