I recently imported all our team's features from Jira into Aha! Develop. I later discovered that the prefix is not able to be changed. Currently, the only way to adjust the prefix would be to reimport them—either delete and then re-add from Jira or to export in a CSV, then import back into Aha! Develop.
A simpler approach, like the one today in Aha! Roadmaps would be appreciated!