QB Issue Resolution:

You can change the home currency in QuickBooks Online only if you haven’t activated the Multicurrency feature. Since the feature is already activated, you can only change it by deleting all your data and starting over from scratch. For your guide, check out this link.

 

Here are the lists of articles you can read more about how multicurrency works:

Resolution for Issue 'Our accounts is in an incorrect home currency since several years ago. Multicurrency feature is also turned on. What is best way to correct this going forward? Thank you.' available: Yes (Solved).
Source: Intuit Community forum.

Our accounts is in an incorrect home currency since several years ago. Multicurrency feature is also turned on. What is best way to correct this going forward? Thank you.: 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 Banking
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Error Recovery for Banking [Canada]
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