If I'm understanding your post correctly
Only the screen that you initially found in the center of your laptop is designed to go full screen. The screen in the upper left of Hoster will not go full screen although you can resize it or move it (from the tools tab), but if you make it to large you will no longer have acces to your program buttons. This screen is only for keeping an eye on the song progress without having to look at the tv while you are entering more songs.
The manual under the help tab covers this pretty thouroghly.
Sam
__________________
|