On Thursday, April 1, 2010 at 10:11:01 PM UTC+5:30, gnat wrote:
I am trying to Sort from A-Z, but the normal warning to expand the selection
does not appear? Is there some way to enable this or work around it to
filter the entire document by the column I choose?

If you facing same problem in 2021 then it is because you are working on table format

Solution :

Clear "Table Format" and then apply "sort" . The sort warning will be pop up