Hi, @seasidefolly.
To better assist you, what specific product and version are you referring to? This further information will help me provide the most appropriate response, specific to your concern.
In the meantime, please know that QuickBooks Online (QBO) has Simple Start, Essentials, Plus, and Advanced versions, and all are now being transitioned to the new and updated interface, where the option to opt out is no longer available.
On the other hand, QuickBooks Desktop Enterprise is the only version that is fully supported.
Feel free to respond and provide more details, and we're here to assist you.