In the manual, in Interface (#xiphos-bible-parallel), the first paragraph gives the essentials of using the parallel mode, but as I new user I completely missed the short sentence about how to choose the versions to show. I was surprised it was done differently that just selecting from the module display. (It would be a new feature request to change that). I would suggest that the text bring this point out more visibly, such as in the attached.
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Suggested text for module improvement.
done in -r4205 with a few edits.