The origin offset parameters control where the machine origin (i.e. x0. y0. z0.) is relative to the project's volume. You must press 'Apply' below the origin offset inputs in order to update the positioning of the project relative to the machine origin, which is depicted as a red/green/blue axis. If you want the front-left top corner then use an X/Y offset of zero percent and a Z offset of 100%. This is detailed further in the User Guide found in the Help menu.