Once I had entered a site John Smith Wiki via Google, say, I used to be able to input a search word in the Google box, say, Jones and 'Jones' would would appear along the RH end of the line.
Clicking Jones there would automatically Find all mentions of it in the article.
During an unintended change to the toolbar, this facility is now lost.
Please how do I get it back?
I think the current version of the toolbar no longer has that facility. If you have enabled "Show highlighted text in the search box", words you highlight by click-dragging will appear as you describe but even if switched off typed words do not appear.