Valerie Junk covers a pair of options:
In this tutorial, I want to show a small but very practical formatting setting in Power BI.
When we create a table or matrix visual, we sometimes end up with white space on the right side. For example, if you show data by month and you only have 6 months of data so far, but you design the visual to fit 12 months, the table/matrix is already sized for the full year, which leads to a lot of empty space.
In Power BI we have two column header formatting options:
Click through for the two options, where you can find the option, and some important information around both options.