How to remove Add a comment option from Highlight menu

Hi,

I use Pdf Embed API, I set showCommentsPanel: false and I use annotation API (enableAnnotationAPIs: true). When highlighted text is clicked then there is displayed Add a comment option in Highlight menu. I think, it shouldnt't be there if comments panel is hidden, because it does nothing in that configuration. 

I noticed that on overview website Add a comment option doesn't appear in highlight menu:

How can I get the same effect?