By selecting Show Origin, two red (default color) lines will be highlighted along the center X and Y axis of the View Window. Where the two lines cross is where the origin and center of the design are located. When you center your design it will be centered here at the origin. All default settings can be changed by right-clicking over the tool and entering the properties menu. You can find this function in two locations: the toolbar button or under the View Menu.
You can also access this function by right-clicking in the AMAYA OS window.