From your brief explanation, I think you want to set a constant set of column headings, e.g. Jan Feb Mar Apr through to Dec.
If I’m barking up the right tree, once you have created the crosstab query, go to the design view of the query, highlight the column with Column Heading in the crosstab line.
Go to the properties of the column, enter your required column headings in the "Column Headings" fields, see attached example.
Note once you set your column heading are set, the query must have the same format date = Jan - column heading = Jan then data will be produced in that field, if you format date = January - column heading = Jan then crosstab output will be null