I have asked this as well. For example in your table the column on the right has alot of white space. In my example I wanted to narrow that..... but it seems the tiles are not super granular to such adjustments.
I note that your color column is widened to accommodate your field name - - possibly if you shorten that it may be less wide. But overall I've not been real successful in granular tweaking of column width in tiles. Would love myself to learn more on this topic if something can be done.