If the "Conversations" option is selected then sorting by other options except for "Date" is not observed. It appears necessary to first clear the "Conversations" option, then select whatever option by which you want to sort, except not "Conversations".
how do you clear the conversations I can sort by every catagory except from I have it on conversations with the message 77 conversations to the right in italics
how do you clear it
Availability of the option to sort by sender is inconsistent/intermittent. Sometimes the option's available and, during the same session, sometimes it's not. Comcast issue; they keep changing email without ensuring that the change is functional beyond access to email..