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.
And upload it to the directory you want to restrict listing.
This will prevent user from seeing all files on your web server directory.