I'll share some inputs about how home currency works when multi-currency is turned on, su-tan.
Once the Multi-currency feature is enabled, you'll no longer deactivate or change its home currency.
You can check these resources to learn more about how QuickBooks Online handles multi-currency:
In addition, you can designate a foreign currency to a customer in QBO to enable the recording of transactions in which the customer pays you.
Here's how:
Keep me updated if you have other questions while performing tasks on your account. The Community is always ready to help you out.
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