The Missing Extensions
When browsing through folders using Nautilus, the default file manager in Ubuntu, the software attempts to keep the visual grid neat and tidy. If you have files with very long names (e.g., `2023_Q4_Financial_Report_Final_v3.pdf`), Nautilus will automatically truncate the display name, replacing the middle or end of the text with an ellipsis (`2023_Q4_Finan…v3.pdf` or `2023_Q4_Financial_…`). While this looks clean in Icon View, it is incredibly frustrating when you have a folder full of files that all begin with the exact same prefix, as the auto-truncation hides the unique identifiers and the file extensions, making it impossible to tell the files apart at a glance.
Forcing Full Filenames
To prioritize information over aesthetics and stop Ubuntu from automatically truncating your file names in the file manager, you must adjust the default zoom level or switch the layout view.
The simplest and most effective solution is to stop using Icon View for data-heavy folders. Open Files (Nautilus). In the top-right corner of the window, you will see two icons next to the search magnifying glass: one representing a grid, and one representing a list with horizontal lines. Click the List View icon (the horizontal lines). List View inherently provides much more horizontal space for the `Name` column. If the names are still slightly truncated, hover your mouse over the vertical dividing line between the “Name” and “Size” column headers until the cursor turns into a double-arrow. Click and drag this divider to the right to manually expand the column width. Nautilus will remember this column width for future sessions, ensuring your long filenames are always fully readable.