The New Era: how to hide hand?

The rules state that the player’s hand should be hidden. How can this be accomplished with the 1.0 version of The New Era?

I see how to put cards on the table (grey area). Is the card hiding/unhiding done through the “flip” action? I am wondering if the flipped cards become visible to the opponents… I have not been able to check this yet, as I was just trying the module by myself…

Any help would be much appreciated!

Alright, this was it: cards with a green border are not seen by the other player(s?), while cards without this border (“flipped” / Ctrl-F) cards are visible by the other player(s?).

PS: I also just noticed that each faction has their own window where they can put their hand…