So you just want the Name column to have a maximum width? You can do that in a few different ways, but the simplest is to turn off auto-size for that column (from the main window, Folder > Folder Format).
For more detail:
The top of that explains how to make those changes become your new default for all folders. At the bottom of the post, there's a video about different column resizing modes.
(A couple of things in the video have changed slightly in Opus 13: "Folder > Folder Options" is now "Folder Format". And the "Save" button in the folder format dialog is at the bottom instead of the top now. There's also a new Settings > Set Lister Defaults which for a simplified way of saving the changes.)