On the Windows side, since dotfiles and directories created by ported applications often don't get flagged with the NTFS Hidden attribute, you can also use the Filters feature for hiding. Just exclude all files matching .* and all directories matching .*/.

(Oh, wait, you wanted to show hidden files. Well... someone else might find this useful, then. 🙄)

It's also possible to quickly show/hide hidden files using Ctrl+Alt+H shortcut. This is very handy e.g. if most of the time seeing them is not needed.

See the Show hidden files option:
https://winscp.net/eng/docs/ui_pref_panels

Can an option to display hidden files be added to WinSCP, and in particular on the remote (Linux) end? This will allow the editing of such files to seamlessly integrated into the functionality of the program.