Logic Pro 9 converting viola part in score editor


I am trying to get a readable score but am stymied by the viola part which converts to two staves when I want only one. I have been able to fix other clefs (don't recall how.) but I can't in this case. How would I do this (step-by-step please!)?
I haven't found that, though I have been able to convert the viola, this seemed to be accidental and I still don't understand completely how I did it. And other aspects of the score reader still seem mysterious. But my Nocturne so far seems well set-up. I will now be able to deal with the header-footer titles, pagination, © info etc. I understand about slurs, expression and other things that need adding.
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