Is it possible to change the currency for the invoice?

Hello there, this is my first time in this forum, I have used the demo on the website and I couldnt find an option to change the currency in the system, probably because I was not an administrator but just to make sure, is it possible to change the currency in the system? Preferably to Saudi Riyals? Please advise.

If you are an admin, you can try Admin >> Currencies and create a new one there.