The currency symbol was completed under currencies and the currency is active as it is my only currency.
On the dashboard under catalog/products I can see the symbol next to each product but when your on the website it does not show.
That's sound like an outstanding issue. Please submit a new ticket to EShop category to send me the super admin account to your site so I can help you to check.
Hope to receive your ticket soon.
Sincerely, Giang
