How to reorder columns in Time and Sales on XTrader Pro?

Hi
I am wanting to get my Time & Sales windows right and to have the Timestamp on the other side of the window (right) and the Quantity field on the left of the Time and Sales window. I can filter and select columns, however I can't seem to move or re-arrange the column headers so I can have them in the right order, are they set in stone?
What am I missing?
Kind regards
Kent