As the seats of both Keon and Cain were in the platform, their physical position was higher than the people below causing them to look down at the Nobles in a literal sense
An Emperor or Empress looking down at their subjects, including these old Nobles are natural and something that they all could accept
As for the 1st and 4th Prince, since the Nobles were trying to make them the next Emperor, they also let them look down at them
However, if was different if the ones doing that was an Imperial Moon and the other is a Duke that is probably still wet behind his ears
The way they look at the Nobles made them feel uncomfortable and they don't like it
"Y-Your Highness, what are you doing?" One of the Nobles around asks the question that every Noble in the Throne Room wants to ask and everyone waited for Keon's answer