Hi there,
The plugin disables the multi-currency feature of WooCommerce Payments if you also have a pricing zone in a different currency than the shop base currency.
We disable this option because having two multi-currency plugins enabled in the shop will cause issues (we receive many support requests related to this feature).
Note that the multi-currency feature of WooCommerce payments overwrites the price and currency you defined using “Price Based on Country,” so there is no sense to keep this option enabled if you are using the multi-currency feature of “Price Based on Country” (via pricing zones).
In addition, you do not need to enable the multi-currency feature of WooCommerce payments to receive payments in multiple currencies.
If you are comfortable using the multi-currency feature of WooCommerce Payments, feel free to use this option instead of the “Price Based on Country” plugin.