Let me share some insights about changing home currency, ak-ndlovu.
Changing home currency can affect your previous reports or transactions within QuickBooks Online (QBO). That is why the product developers didn't put an option to change that easily. A prompt message was also added before turning on the multicurrency that, once it is turned on then the home currency can't be changed.
You can only change the home currency of the company if you start over by purging or creating a new company.
Here are the lists of articles you can read more about how multicurrency works: