[dumbluck]

I hope I remember this right.

You can edit existing strategies and/or add new ones. This feature is accessed under the little crown in the top left menu; Empires I believe is the name. On the right hand side should be a button labeled "Strategies". Click that, and you see the strategy editing screen. On the left is a list of all your strategies. click on the the empty square beside "Capture planet" to put the green dot in it.

You are now viewing the details of that strategy. In the center are a couple of windows, on the right are several more buttons. One should be labeled "Formations" (i think). Click on it. At the center top window (i think) is a list of all available ship types. Green dots beside them means that they WILL break formation. When capturing planets, this is very bad. Make sure none of your ship types are marked to break formation.

There are other ways to fine tune the strategy, but I'm not familiar enough with it all to go into details...

I hope that helps..