Problem with bilingual review

Hi!

One of my clients recently started sending me GroupShare projects. For quality control purposes, I always review the files in "bilingual review" after translation, before returning the file to the client. However, with GroupShare, I don't get the "top-down"-option - I can only review the files side-by-side. Is this a setting my client can change, or how do I go about viewing the files top-down? The kind of segments I translate for this client are much more easily reviewed top-down.

Kind regards,

Johanna