Enable Show hidden files preference option:
https://winscp.net/eng/docs/ui_pref_panels

Or even easier, there's a counter of hidden files below the file panel. Just click the counter to display the hidden files.

i recently had to reinstall my program. After doing so I cannot see hidden files in the remote directory. (In my specific case the file is the .htaccess file). It is not in the list

What do I need to change in order to see that hidden file in the listing?

using 5.9.4