I couldn't have explained it better myself that is why changing the screensize to one ending in bl exposes the menu text thank you notjy for explaining the purpose of the screen size adjustments.
Some of the releases of Secret of Mana use a fixed-width font and it is one of the few games to use high resolution mode of 512x448 for the status info text.
ps Oh you can change it to any setting you wish after you are out of the game menu.