The Short Overview section used to exist in the metadata manager, however, after reading https://emby.media/community/index.php?/topic/44536-short-overview-section-missing-in-metadata-manager/ it appears that it has been removed as ' Emby does not make any use of this information, therefore it's being removed from the editor. In the future if we start using it, then it can return'.
However, Kodi makes use of this information, so it impacts lots of people who use Emby-for-Kodi. The Short Overview used to contain the plot outline from imdb, and the 'overview' would give the longer description of the plot. This full Overview often contains spoilers as well. Now the full Overview is what we see for each film we add, which is really annoying.
Please bring back Short Overview.