Hi Janet,
You cannot override the alignment for attribute types; strings/dates will be aligned to the left, numbers to the right. If you want to change the alignment for a number, you should change the attribute type to String or add a string attribute in your Domain Model.
As only numeric data related to size should be aligned to the right, it is fair to request control over alignment on the idea section.
Try data grid 2 → Custom content → you can specifiy the Alignment in that and it would be easy to allign it
For the regular data grid, select the column and add text-align:left to the Style.