I recently attended a concert by the CBSO (City of Birmingham Symphony Orchestra) and was surprised to see an unfamiliar layout of the instruments. I frequently attend CBSO concerts and most of the time the strings are arranged in the same way: from the left 1st violins, 2nd violins, violas, and cellos with the basses behind the cellos. Occasionally, they use an arrangement that I now know is called antiphonal, see this previous question. However this recent concert used yet another arrangement. The violins, violas, and cellos were as is common but the basses were in a line at the back of the orchestra where the percussion typically is. Conversely, the percussion were behind the cellos.
Is this a common arrangement with some benefits or probably just a preference of the conductor?
The conductor was Klaus Mäkelä and we heard the Tchaikovsky Violin Concerto and Berlioz Symphonie Fantastique; the soloist was Nicola Benedetti. Details here.