HIGHLIGHTED COLUMN D …SORT ICON NOT HIGHLIGHTED
If the question is about Calc documents, please tag it adequately.
(To use upper case for the complete text is not welcome in forums.)
‘Read only’ document?
Not in edit mode?
Sheet protected with (at least part of) column D consisting of protected cells?
I created the document and constantly make changes
Ok. My guesses don’t seem to be right. More guessing (if any reasonable) won’t help.
Please upload a file showing the issue for you. I will see for enough “karma”.
(Edit your question to attach the file.)
how do I attach a file for you to see?
If you edit your question (don’t miss to tag it ‘calc’) you can use the paperclip tool above the editing window to attach a file. (Not all file extensions allowed, but ods, of course, is.)