Monthly charts default to "January, February, March…" or "Jan, Feb, Mar…", and both eat into the plot area, especially on a narrow visual or when you have a full year of columns. Single letters are the obvious fix — but Power BI sees the three J's as the same value and collapses January, June, and July together, and the axis falls back to alphabetical order instead of running through the year.

This skill handles both problems for you. It adds a column that shows a single letter on the axis while keeping each month distinct behind the scenes, and locks the order to the calendar. You get a compact J F M A M J J A S O N D axis that still slices, filters, and cross-highlights correctly — run it with /month-abbr.