I'm using Service Desk with a next-gen project, and the default sender email address (jira@domain.atlassian.net). The sender name in outbound emails is showing as "External service desk":

How do I change the sender name (red box)? It looks like JIRA is using the name of the project itself, but none of the options I can find in the UI will let me change it.
I don't need to change the outbound email address, and I don't need the emails to contain the name of the agent. I just want all From: names to be "Customer Support" or similar.