[Customer] How to stop shopify from keep switching currency during checkout.

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Hello, I have a question in regarding on currency automatically adjusted.
When I select the product and are at checkout page, the currency keep automatically switch to the local currency of that destination country address. For example, I’m buying product to be shipped to Thailand, it auto  changes my currency to THB Baht.
I want to keep the preference currency just like before in which I can decide to keep it as USD, NOT auto change back to THB. 

Below is an example of message when I input location address as Thailand
It seems that the currency does follow the shipping country destination in which I prefer to set my own currency preference. 
Is there any one know how can I do that keep my USD preference?
Looking to hear back soon!
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