“too big”
In a previous life, I had occasion to walk through the Smithsonian Museum of art or whatever it is called. They were having an exhibition of paintings by Frederic Edwin Church. All of the ones I saw were “too big”.
The size of pieces in a given exhibition is decided by the exhibit’s curator in relation to the other pieces to be exhibited and the space available. If you were looking at an exhibit by one artist, there were probably fewer pieces included than in the exhibit cited in the above lawsuit. Fewer pieces = more room to display larger works.