What does this mean in Mail for Mac?

I was dragging columns around in Mail for Mac, and somehow ended up with this hollow circle column header that I now am unable to get rid of. Anyone know what it is, and how to get rid of it?



When I right-click on the column headers, this is what it shows is enabled:


MacBook Pro 14″, macOS 15.5

Posted on Jul 8, 2025 09:52 AM

Reply
3 replies

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

What does this mean in Mail for Mac?

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.