Organisation currency set up

Hello, @Yejin Cho. I'll provide information about changing currency in QuickBooks Online (QBO).
 

Yes, it's still possible If you haven't enabled the Multi-currency feature yet. You can still adjust the home currency in the Account and settings. However, once you've turned on the feature, you won't be able to turn it off and make changes.  
 

Here's how to set it up:
 

1. From the Gear icon, select Account and settings.
2. Scroll down and click Advanced from the left menu.
3. From the Currency section, choose your preferred currency from the drop-down list.
4. Click the Save button. Then, Done.
    

To learn more about multi-currency feature, check out this article: Multi-currency FAQ.
 

If you need further help setting up your home currency in QBO, please don't hesitate to leave a reply below. We're always here to help. Have a good one.