When it comes to marking accounts for 1099-S and preparing them, I understand that it can seem daunting, but rest assured, I'm here to share insights about this.
QuickBooks Online only caters to 1099 NEC or MISC right now. Thus, you need to file the 1099-S form outside QuickBooks. For more details, I recommend checking out this link: About Form 1099-S, Proceeds from Real Estate Transactions.
Furthermore, you can also utilize and examine this particular resource, which contains detailed instructions for completing Form 1099-S: Guidance for Form 1099-S.
Keep me posted if you have additional queries about the 1099-S form. We can tackle this together and make sure everything is taken care of smoothly and accurately.