Set the Product filter to All to see entries for all products.
Set the Product filter to Selected and click Select to see entries only for selected products.
Type a different term or reverse the order of the words you type. For example, if you are looking for creating M-files, type M-files and look for the subentry creating.
After selecting an entry, search for the term in the displayed page using the Find in page field, located at the top of the display pane.
See the product and section of documentation associated with the entry using the second column in the Help Navigator pane. You might need to make the pane wider to see it.