(3) There are a couple of rather advanced attainments that increase the maximum number of ships you can build. (2) When I wish to exchange things between a ship and a warehouse, sometimes the strongbox tab appears at the bottom left of the popup window, and sometimes it doesn't. What I've done to exit is click on the 'build' icon, but it seems like just an awkward work-around. This can be disastrous if one doesn't notice the mistake immediately.
This sends the ships towards wherever I've clicked and they drop what they were assigned to do.
Often after directing ships to such an activity, I scroll around the map and click somewhere.
(1) After sending a ship or fleet to an activity such as escorting or attacking, how do we exit that process to do something else? Neither a right-click nor a left-click on the mouse seems to do it.