Settings opens GG Cabinet Tools — Settings. The line under the title reads «GG Cabinet Tools — versions»; that is only a subtitle. There is no Versions tab. Three tabs: Account, Nesting, Toolbar.
The section title is Nesting (ABF Extra Nesting). The subtitle is: default margins used when packing boards onto sheets.
Save writes the values and reports «Saved». Restore defaults only fills the form; the status line says the defaults are loaded and to press Save to apply.
The title is Toolbar icons. Drag to reorder. Untick to hide an icon. Changes apply after you restart SketchUp.
Each row: a drag handle, the icon, the name, a shortcut badge (or a dash if none is assigned), a copy-name button, a play button (opens that tool's guide: the video and how to use it), and a visibility switch.
Copy name copies the tool name so you can paste it into SketchUp's shortcut filter, and shows a message about that. Save and Reset to default both report: saved — restart SketchUp to apply.