"Toggle Mark" Command in an open reference, etc.

What is it supposed to do? If I click this button it says:

Table_bib_main: Dataset not in edit or insert mode

I encountered this when I tried to see how I could remove a “duplicate” mark that Search for duplicates created. I would welcome an advice on this too.

And maybe all of this could go to Help? I tried searching for “toggle mark” or read about duplicates but found nothing.

Also, is it possible to limit the search on the site to Handbooks only?

Anna, I cannot reproduce

Anna, I cannot reproduce this. I need a detailed instruction. After doing a search, click the "Advanced Search" hyperlink just below the search edit box, you can then check the "book page" box only.

Sent you a video of it....

Sent you a video of it....