You can change this the following way:
- Open a random deal
- Click on ‘View all properties’ at the bottom of the ‘About’ section
- Click on the Currency property (see the highlighted part in the screenshot) and drag it up to the correct position
- Go back to the deal view and it should all be fine now. See here for example:
Please note that this setting is user specific. Every user needs to change this once manually. The setting also applies to the preview functionality. Let me know if it doesn’t work for you.