Delete the figure you don't want. Then load the figure you do want to load as default. Then Edit->General Preferences and in the dialog box click the 'Set Preferred State' button, and enable 'Launch to preferred state' and 'Launch to previous state'. Poser should now load the figure you want at start-up. You can set your document window the size you want, drag the toolbars all around the screen, and by clicking on a UI dot the screen layout will be memorised. Then in the event your display goes askew, you can click the UI dot to return it. It's worth setting your display up to your taste and clicking a UI dot before setting that as your preferred state.