You can start to create a new circuit program immediately after you have started WindLGC.
To do so, click on the File new icon in the standard toolbar.
WindLGC then opens the FBD Editor (or the default editor specified under Tools/Options/Editor), and you can create the new circuit program in a new window on the programming interface.
Click on the small arrow on the right side of the File new icon to open the LAD or FBD Editor.