This query has the same answer as a recent query which involved the noun (ogre) followed by an adjective (grand), and then being followed by a complement (comme une maison) - it is one of the situations in which adjectives follow the noun in French. 

In this case, situation 5 in the lesson - adjective (nouvelle) modified by multisyllabic adverb (totalement). 

Remember, adjectives following the noun is the norm in French, and there are exceptions where the adjective can precede the noun. Only in some of those cases is it because the meaning of the adjective changes when placed before rather than after.

adjectives-usually-go-after-nouns-positions-of-adjectives

Hi Una,

This exposition is a new totally original exhibition (concrete sense), as opposed to a new alternative version (abstract sense) which is what would be implied if the adjective were to be placed in front of the noun.

Hope this helps.

Jim