By default, the file manager does not display certain system and backup files in folders. This practice prevents accidental modification or deletion of them, which can impair the operation of the computer, and also reduces clutter in locations such as your Home folder. The file manager does not display:
Hidden files, whose file name begins with a period (.)
Backup files, whose file name ends with a tilde (~)
Files that are listed in a particular folder's .hidden file
To hide or show hidden files in a particular folder, select View → Show Hidden Files. To set the file manager to always show hidden files, set the Views preference to Show Hidden and Backup Files. For more information, see Setting File Manager Preferences.
To hide a file or folder in the file manager, either rename the file so its name begins with the period (.) character, or create a text file named .hidden in the same folder and add its name to it.
To refresh the relevant file manager window to see the change, press Ctrl+R.