Thanks for sharing your thoughts in this thread, @LOFT Design Co. I understand how you want to disable the multicurrency feature in your QuickBooks company. 

As one of my colleagues mentioned, once you enable this feature, the currency conversion details will be accounted for in the system. 

You'll want to share your comments and suggestions directly with our product developers by visiting this link: QuickBooks Feedback online form.

Your inputs are very important to us. Please feel free to raise your concerns again and we're always around to guide you more.