I have the steps to change your product and services to No Vat in QuickBooks Online.
At the moment, the Batch Action feature for product and services items only includes making them inactive, adjusting quantity on hand, reordering, and making a non-inventory item or service item. If you want to change them to No Vat, you'll need to edit one at a time. I'll show you how.
Go to the Gear icon.
Select Products and services.
Click Edit on the product you want to change.
In the VAT section dropdown, choose No Vat.
Hit Save and close.
You need to repeat the same process for the rest of your products and services items. Let me share some helpful articles to learn more about managing your product and services: