"Search options" to choose flex or exact is grayed out. What gives?

[johnburnett]

I want to do an exact search for εἷς so that i don't get εις in the results.

 

I know that i'm supposed to click the little magnifying glass at the left of the search field, and that at the bottom of the pop up I'll find a section entitled, "Search options", offering me the opportunity to choose either 'flex' or 'exact'.

But this is grayed out and i can't choose it. Moreover, changing the option in my Preferences panel doesn't have any effect either.

I want flex as my default, but how can i occasionally invoke exact?

Why are the "search options" grayed out?

Edited March 19, 2016 by johnburnett

[Joel Brown]

Flex-Exact distinction is actually for English texts, which is why it is greyed out for you here.  To do your search, simply precede the word with an equals sign (=).