If you are selling VATable goods/services but outside the EU, this would be out of scope rather than no VAT.
I think the option you should be using here is the out of scope VAT button, although you need to enable it first (as per my first screenshot above). The button then appears on the create invoice screen:
However, I’m not an accountant, so I’d recommend speaking to one about this.
VAT certainly isn’t my hot topic, so I could very well be wrong, but an accountant should be able to guide you in the right direction.
There’s also a useful guide here: