Starting today we can't turn off custom transaction numbers either. Appears to save and then resets every time we even open the invoice screen to view, edit or create an invoice, the account-wide setting is mysteriously reset.

Tried chatting with support, did a screen share to show this, and have not been able to get a clear answer about what's happening (is it a bug and you're working on it? Is it a change in feature support? something else?). All I can get is "Here's the thing, if you already turn on your sales setting before. Please know that you're not be able to turn it off due to the new layout updated." I don't know what that means.