Black Swan is designed by Emanuele Santandrea and published in 2020 by VentoNuovo Games. It is owned and copyrighted by VentoNuovo Games, and I present it as a Vassal module with their permission. Please visit the VentoNuovo website at http://www.ventonuovo.net/. You can find the latest rules there. This Vassal module was created by Filip Labarque in 2020.
Once you start an online game, you can (and probably should) hide you pieces from the opponent by clicking on the respective Hide Axis/Allies button. You can see when your units are hidden by the white outline around the unit. Note that you cannot manipulate the pieces of the opponent.
When playing solo you can hide/reveal the units of each side by clicking on the corresponding Hide Axis/Allies Solo. When in solo mode, you can manipulate all pieces.
Each unit has a right-click menu:
This shows what manipulations you can do on the units.