It is a more formal chorus, and the songs are red, classic, etc. It is recommended that the formation should be strict and standardized. A formation of several rows arranged horizontally according to each voice part.
But the "Gardenia Blossoms" you sang is a relatively fresh and lyrical campus folk song. It can be arranged in a relatively free form and does not necessarily have to stand in a disciplined manner. According to the characteristics of the stage, part of the formation can be standing or part sitting, or it is better to have some more lively and lively performances, which can better reflect the expression of the friendship between the students when they graduate and say goodbye!
I hope my answer will be helpful to your rehearsal performance.