First, there used to be a columnar format that included a heading. I could sort entries by double clicking the column heading. This was handy for selecting email by date and deleting or moving them. That seems to have disappeared in Versiona 128.9 Oesr. Is there a way to recover that view? The reason I discovered this is that I'm receiving a message on virtually every attempted Thunderbird operation saying that there is not enough disk space to complete the operation. I cannot tell if this is a Thunderbird message or a Microsoft (Windows 11) message. I've attached a screenshot. I've checked and there should be plenty of disk space; but, of course, there is a lot of spam mail in my T-Bird that I could easily delete. I've tried setting up Message Filters to delete unwanted email but that, too, produces the error message. Can anyone tell me how to a) get my column headings back in T-bird, and b) fix whatever is causing the message?