I turned on "Autonomous" PayBill/PayAllBills for both the mailbox, and the bills themselves, but the Sims still do not pay them autonomously.

UPDATE: Can I use Returner to stop Bill Arrival? Is that a thing? lol

Found them. The "Field Trip" is in the school (general) settings, where-as the Visit/BringHome Chance has to be changed in the school (elementary) or school (high) menu. Thank you both.

Okay. I found the Field Trip one, and I found the BringHomeChance. However, does that mean if I turn off "Wants to know if they can go over after school" I can only do so if I turn off coming over to the active lot too?

Is there a way to turn off "field trip" and/or "wants to know if they can go over after school" prompts?