There are many articles online related to this FileZilla Option: Server->Force showing hidden files
Notice that this option is deprecated (it uses the LIST -a command which is deprecated). On nowadays FTP servers this option has no effect. Modern servers use MLSD command for directory listings. So if the server knows this command, FileZilla (and other FTP clients) will use it by default.
Related KB article: Use FileZilla to connect via FTP to your web hosting account