Matrix visual - same length for columns/ fine-control

Anonymous , Most of the time it is auto-adjusted. Like excel you can do a little bit of adjustment. But that might go away with refresh

This might help:

https://www.purplefrogsystems.com/blog/2021/04/how-to-make-your-matrix-column-widths-all-equal-to-each-other-in-power-bi-using-dax/