Working intensively with the Chess Suite can lead to an abundance of open windows. This can be a hindrance, for example, if they all have to be minimized in order to do something else.

If you switch the Multi Document Interface in the menu Properties of the start dialog on, then after a restart of the Chess Suite all windows are part of a larger window (you probably know this behavior from some office programs). 

The Multi Document Interface setting will be permanent until it is changed again.