Create a .htaccess file by opening a new text document using notepad and saving it as “.htaccess”. must include the quotation marks so that notepad won’t give it an extension of .txt automatically. Or you can create a .txt file and rename it to .htacess
Add this words to your txt document.
Options -Indexes.
Then save.
And upload it to the directory you want to restrict listing.
This will prevent user from seeing all files on your web server directory.