I can't remember if this was true in the old version of the site, but... this is a request that would make search pages more transparent.
Currently, when looking at a page of recipe search results on My Bookshelf, most of the search constraints applied are visible: keywords, sort order, filter terms chosen or excluded. But if a book or recipe Bookmark is used to further restrict the choices (via 'Look in Books' or 'Show only Recipes'), it doesn't appear at or near the dialog box where it's selected.
When doing a search of recipes, I often restrict it to a particular subgroup of books by choosing a Bookmark from 'Look in Books'. Once I do that, it seems to narrow down the choices correctly, but it's a little unsettling because there's no way to confirm which Bookmark is in effect as a search restriction -- even if you open the drop-down dialog, it doesn't default to showing the selection highlighted, but reverts to the no-choice position.
The same thing is true if a restriction is made via 'Show only Recipes' -- but at least there the operative Bookmark can be guessed at by scanning for the Bookmark the search results have in common, since Bookmarks display with the recipes (in the default list view, at least). Still, it would be better if it were visible at the dialog box where it was selected.
This is more in the nature of a bug fix than a wanted features (and hopefully easier to implement than many of those).
[Re-edited to restore my original impression; behavior is the same with both Book and Recipe Bookmarks.]