Edit currency related to an element entry

Summary:

Content (required):

Hi, when I Add a new element entry the system automatically associate the currency and I can see this field one once i click on "Ok".

Do you know if this field can be editable? Now it's grey and i cannot change it

Thanks

Alberto

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):