Unable to use " Add to Note"

I want to use "Add to Note" when I highlight something.
However, on my Zotero, "Add to Note" isn't available.
Is there any specific setting for it?

I am using Zotero 6.0.37
I really appreciate any help you can provide.
https://s3.amazonaws.com/zotero.org/images/forums/u6102659/l1eo0mszgrp2r9dl7oaz.png

This discussion has been closed.