How can I modify the Plain Table (Customisable)?

I need to change the appearance of the table but I can’t figure out how to do it.

CMS Version

Version 4.3.1

Player Type

Include the Player type you are using.

Player Version

Windows 11 player 4 R405.3

Issue

I’d like to narrow the columns so they fit the width of the longest string.

I can’t figure out or find how to do this.