Hi,
I'm not clear what you mean by "I need the 20% VAT removed from the total".
With the "floating tax prices" setting activated, the price you enter in the product will be the total price paid by the user, regardless of the taxes applied on the product.
So if you want the total to vary based on the tax applied to the customer, you don't want to activate that setting.
Note that you'll still be able to enter the price of the products with tax in your products, however, you'll have to edit the price of the products already entered as HikaShop will think it is the price without taxes, while in fact it's the price with 20% tax you entered.
For example, suppose that the price without taxes of your product is 10.
You've entered 12 for your product price with the floating tax price.
So right now, the total will always be 12, with either a price without taxes of 10 (for 20% tax) or 12 (for 0% tax).
Now, you'll turn off the "floating tax price" setting.
So in the product you'll see a price without taxes of 12, and based on the taxes, it will either be 13.2 (for 20% tax) or 12 with taxes (for 0% tax).
So you'll have to adjust the price of the product to 10, so that you get a price with taxes of 12 (for 20% tax), and 10 (for 0% tax).