Hi Mark,
The currency symbol settings should work in Event Tickets without the Event Tickets Plus extension. If this isn’t working on your end, I would recommend running through these steps as a starting point.
We are not able to provide technical support here in the Pre-Sales forum, as we use it to answer questions about the features of our premium plugins for those interested in purchasing them. You can however post in our community forum on wordpress.org, which we review weekly to check for bug reports. If you need more in-depth support, you will need to purchase a license.
Our knowledgebase is another great resource, and you can also search our premium forums to see if another user has posted about a similar issue.
Thanks,
Jennifer