web.config file directory enable to true(IIS server directory enable to true)

 <configuration>

   <system.webServer>

      <directoryBrowse enabled="true" showFlags="Date,Time,Extension,Size" />

   </system.webServer>

</configuration>

or in IIS you have to GOTO directory browsing and than click on enable.

reference(https://kapooryash.blogspot.com/2021/11/to-see-directory-of-website.html)