Aurea dining opens at 6. Just show up.
For the first few nights I recommend you show the host/hostess your cruise card that says Aurea. (Regular dining first seating also opens at 6. You don’t want to get shuffled way to the back of the dining room. The Aurea section is right up front.)
Once they get to know you, they will know your preferences.
We prefer a 2 top. After about the third night of this 23 day cruise, they/we were on autopilot. Sometimes we’d show up right at 6. Sometimes not until 8. We were always seated among the same 3 or 4 tables.