Apache web server allow directory browsing by default. It?s always good to disable directory browsing in security aspect.
1. Login to your CPanel,
2. Click on Index Manager,
3. Directory will be list down. Click on the directory name which you want to disable the directory browsing,
4. Select No Index and click Save,
5. The directory browsing feature should be disable by now.
Under public_html make .htaccess and put this line "Options -Indexes" over there. Thats it.