Current power bi seems not support this. I'd like to suggest you submit this to ideas forum.
There is a workaround you can do, add a blank button(with 0 outline and no fill) on the top of column headers. Bring that button to forward (in format pane) and send back the table backwards (in format pane).
cons: If user selects any value from table, it will become clickable because table will come to focus and button will go back unless focus is released.
Depends on how report will be used.
You'd like it to never appear; or now that it has appeared, you can't get it to go away?
If you can't get it to go away, just remove and re-add the column to the table visual.
I have a work around for this. Hope it helps some people. It's a little extra effort and might not work if you need to adjust the width of your table columns often.
If you have a fairly static width then to hide the arrows you can do as follows:
1) Obviously first you need to Rank/sort the column that you want.
2) Make the table header backgroud and the table header text the same color as the backdrop of the whole report so everything blends in.
3) Insert as many text boxes as column headers and duplicate the column names in the text boxes you just created. Make sure the text boxes span the entire width of the columns and it covers the arrows in each column. When someone goes to try to sort the columns they will instead find themselves clicking on text boxes and nothing will happen to the sort order of the Table.
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