Hey there hjulien-powershi,
It's always a pleasure to see new faces in the Community, Welcome! Thanks for reaching out to us here. QuickBooks Online is a great tool, able to help keep your books balanced. I would be happy to provide some information.
At this time, the option to change the Home currency isn't available in QuickBooks. I can see how having this option would be beneficial for you. I encourage you to leave feedback by heading to the Gear icon and selecting the Feedback option. These comments are viewed and considered by our developers as they create new features and updates for QuickBooks.
If you have any other questions, feel free to reach back out to us here.