I'm glad to see you here in the Community, steve279.
Let me share some insights on how QuickBooks Online (QBO) works when receiving payments.
If you use the Receive Payment feature on the + New button, the option available when saving the transactions are Save and close and Save and new. But if you received payment on the Invoice page when going to the Sales menu, you can choose Save and close, Save and new, and Save and send.
As for your concern, the option to default the system to Save and close when receiving the invoice payment is unavailable. In the meantime, you'll need to select the Save and close option when saving the transaction.
For guidance in recording your invoice payments, check this article: Record invoice payments in QuickBooks Online.
To learn more about Payment deposits, you can read this resource: Find out when QuickBooks Payments deposits customer payments.
As always, you can reply here or create a new thread if you have any other questions. I'm here ready to guide you all the way. Take care.