QB Issue Resolution:

If you have multi currency turned on then that fixes your home currency and you cannot change it. If you have not turned it on you can change it by going to the gear icon, then Company Settings. Click on Regional Settings to update the currency.

If you cannot change it you may just consider canceling your subscription then starting over. You can cancel by going to the gear icon then Your Account. Click Edit Billing Info then the Cancel Trial or Cancel Subscription link. Follow the onscreen prompts to complete it.

Once done you can resignup and use the same login ID if you choose.

Resolution for Issue 'How do I change Home Currency in QuickBooks Online Plus?' available: Yes (Solved).
Source: Intuit Community forum.

How do I change Home Currency in QuickBooks Online Plus?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for currency
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Error Recovery for currency [Canada]
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