Unable to turn on line numbering when editing packages. It is currently hidden. Tried setting and unsetting the line numbers option (Show line numbers) at View | Toad Options | Editor - Display, but the numbers still don't appear.
The reason that the numbers are not appearing is because the gutter is hidden in the editor, which is where those numbers appear.
Select View | Toad Options | Editor – Display and check ‘Visible Gutter’ in the Gutter and Margin section. Also make sure 'Show line numbers' is still checked.