Change Main Book in Book Maintenance?

Odd one, but I’m not as versed in Epicor Finance; Our finance already created a new Book but failed to set it as “Main Book” and the field is now grayed out. Is there a way to change without having to create another book?

Update: The answer is NO you can’t. If the new book hasn’t been used yet, it can be deleted and re-created otherwise a new book will need to be created and set to Main at time of creation.