The + or +New icon is readily available the moment you start using QBO. There isn't a need to activate it. There isn't an option to deactivate it either. Are you having issues with it? Can you please share a screenshot?
On the other hand, you can check out the Help Articles for your references in the future.
I'm just right here if you need more help with QBO. Have a good day and more power to your business!
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