の席で

at the seat/table

→ の
phrase Rare #32,290
at the seat/table Indicates where an action takes place. Depending on context, 席 can mean a physical seat, a table, or an occasion such as a dinner or party.
JA: 会議の席でその問題について話し合いました。
EN: We discussed that issue at the meeting.

授業の席で座ってろ

Stay seated at your desk in class.

— きっと、うまくいく (2009)

そこの席でいい

Is that seat okay?

— ANORA アノーラ (2024)