Hammer of the Scots - Units cant hide

All the hidden units are visible to each players. And I am using Vassal 3.6.17 to play Hammer-Scots-v8.vmod. May I know what can I do to figure it out?

When you start the vmod, you should read “help / player’s guide.” It should answer your questions. For this particular one, there are two “hide” buttons on the toolbar, which will hide all your blocks depending on which side you signed in as. For example, press “hide Scots” if you are the Scots.