Concordance Search on GroupShare 2017GroupShare TMs does not seem to work

Our external translators need to be able to perform concordance searches on server-based TMs. According to the GS 2017 online documentation this would need to be enabled as follows:

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Enable target language concordance

Select this to enable concordance searches of target text.

If you enable this option, SDL Trados GroupShare indexes the TM target language segments (source language segments are always indexed).

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We don't seem to have this option on our GroupShare TMs and I am wondering if there is a special setting that is required to enable this. I am uploading a screenshot of what we can see - maybe someone out there can help.

The image shows that there is no option that would enable "target language concordance". (I have inserted a screenshot from GroupShare onto the Online docs topic)