Newbie question: Some of my file names are truncated

Sounds like the columns are just not wide enough.

(There was a post here before about pirate stuff; ignore that! That'd truncate names 8.3 style rather than "...")

You can resize the columns by dragging them in the usual way. You can also make them auto-size by turning on the auto-size columns checkbox within Folder Formats, on the Display tab.