and thank you for any responses. I am waiting for my family titre de séjour (first demand). Visa type d expired in two months ago. I need to visit the USA for family reasons. I did not get a récépissé. (Prefecture - Paris said they didn’t have to). Can I leave France and return?
Your additional comment explains a lot and thus I am writing this as an answer.
The visa that you got is a visa long séjour temporaire and not a "visa long séjour valant titre de séjour" or vls-ts, which I mentioned above in my comment. The original purpose of the visa notwithstanding (studies or otherwise) in this case, doesn't really matter. The consulate is right in the sense that your type of visa technically does not allow you to renew it in France. Only VLS-TS visas can be renewed in France (in theory).
Prefectures sometimes accept applications (on a discretionary basis) but they consider it a "favor" that they accepted to look at your change of status request even if they were under no obligation to accept it (sorry to say this, but based on several accounts from various sources, if you weren't American, I doubt they would've accepted your request). And oftentimes in cases like this, they don't give you a récépissé.
Thus, if you want to push through with the status change, I wouldn't recommend you leaving the country unless you decide to forgo the application. If you do leave and then come back, you would be admitted as a tourist (and not a temporary resident), would be subject to the 90/180 rule, and the prefecture could consider that you abandoned your application (like what @phoog said).
If that happens and you want to get the temporary family permit, the prefecture could ask you to leave the country and, as @phoog said in the fomment, re-apply for a new visa D for a different purpose (family visa for example, or something else).
One other option is to try to get what they call a "visa de retour préfectoral" (see here, in French: https://www.demarches.interieur.gouv.fr/particuliers/comment-revenir-france-sorti-espace-schengen) but I heard that they are notoriously quite hard to get and are often only provided for humanitarian considerations. Also, given the type of visa you originally had, it's possible that they will tell you to just apply for a new visa at the consulate anyway.