If the game includes any "variants", you will then get a dialog with assorted buttons and checkboxes to choose from. For instance, some games let you choose whether the whole world is visible when you start, or what kind of scoring system to use.
Different games have different variants, but there are several used by many games.
The "World Seen" checkbox, when set, makes the whole world seen right from the beginning of the game. This only affects the initial view, and you will only see some types of units belonging to other players, such as their cities.
The "See All" checkbox makes everything seen all the time, right down to each occupant of each unit of each side. This makes Xconq more like a boardgame, where everything is "on the table" (so to speak).
The "World Size" button brings up a dialog that you can use to change the dimensions of the world in everybody will be playing. In Xconq, the available area of the world is either a hexagon, or a cylinder wrapping entirely around the world. You get the cylinder by setting the circumference equal to the width of the area. See the generic player's manual for more details about world size and shape.
The "Real Time" button brings up a dialog that you can use to set realtime countdowns. You can limit both the total time allotted to a game, to each turn, and/or to each side.