Hi. I guess you're producing this with a Cube View, so have a look at the Column Width setting to the right of the screenshot:
If you can't find it in Designer mode because of a small screen, you can access it from the Advanced mode instead in the Header Format property (bottom-right corner here):
As for Assets, I'm not sure how you produced that row, but the answer is probably a Conditional Formatting clause. I don't think you can detect "when my columns are not so close to the center", but you can set a minimum width for the row headers to push them further to the right in a reliable way.
I hope this helps a bit, otherwise you might want to ask Support.