Question: Should I put my exposures in the same order as the hand I am playing?

Answer: There is no rule about placing exposures in the order of the hand as shown on the card however, strategically it is best not to. However, when a player declares Mah Jongg, the exposures should be rearranged to match the hand so that the other players can verify a correct Mah Jongg. 

Source:  Mah Jongg Made Easy 2020 page 14