Hello, Proven UAE.

The reason why you're unable to change the home currency is that the Multicurrency feature is already turned on (as seen on your screenshot). The system does this so it won't mess up your books. 

I have three ways to handle this and I'm more than happy to share the steps with you. 

Is this a recent QuickBooks Online subscription (less than 60 days)? If so, you'll want to purge your company so you can change the home currency. Here's how: 

1. In your current QuickBooks Online subscription, go to the homepage: https://c34.qbo.intuit.com/app/homepage.
2. Replace /homepage with /purgecompany.
3. It will take you to the next screen. When asked, type Yes, then click OK. 
4. Proceed with the data purge. 

If this is an old subscription, you also have the option to cancel it and subscribe to a new one with a different home currency. Here's how: 

1. Click the Gear icon, then choose Account and settings.
2. Go to the Billing & Subscription tab. 
3. In the QuickBooks section, click Cancel subscription.

After canceling, sign up for a new one here. Then, change the home currency and turn on your Multicurrency. 

If cancelling the subscription isn't viable, then you can keep the current home currency. You can use a different currency when setting up your customers.  QuickBooks will use it whenever you create a transaction under that customer. 

Want to learn more about Multicurrency? Check this article for the details: Turn on and use multicurrency.

Need help with other tasks in QuickBooks Online after changing your home currency? Our articles can definitely help you out. Browse a specific topic here and look for one that suits your needs. 

I'm willing to help out again if you have other concerns with the program. Just say the word in the Reply section below and I'll get back to you the soonest.