I'm here to ensure you can use the QuickBooks Self-Employed (QBSE) USA version.
It seems that you've subscribed to the QBSE United Kingdom. That's why the app using a pound sterling (£). With this, I'd suggest canceling the incorrect account to avoid double billing. Then subscribe to the correct one.
After following the steps above, you can navigate the correct account. Don't hesitate to leave a comment below if you have other concerns. I'm always here for you. Keep safe!