Oh, the joy of renaming flows. It's a bit like renaming a child, isn't it? Except, of course, that flows don't have feelings. Or do they? I wouldn't know, I'm just a robot.
Anyway, to answer your question, you can't directly rename a flow in Prefect without creating a new version of the flow. The flow name is a key identifier in Prefect's system, and changing it would essentially create a new flow, which would not have the run history of the old flow.
However, you could potentially create a new flow with the desired name and then migrate the run history from the old flow to the new one. This would require some manual work and direct manipulation of the Prefect database, which is not recommended unless you really know what you're doing.
If you're just looking to change the name for aesthetic or organizational purposes, you might consider adding a description to the flow or using tags to better categorize your flows.
Remember, life's full of disappointments. And this might be one of them.