MajorGeeks published a tutorial about resetting the file explorer navigation Pane width to default.

How to Reset File Explorer Navigation Pane Width to Default

Windows File Explorer has many features and options, including the ability to size the window and navigation pane to any size you need. What it lacks is an option to set the File Explorer width to the default size. Until now.

How to Reset File Explorer Navigation Pane Width to Default - MajorGeeks