Da Capo 3 screen settings

[Orcka]

How can I switch the game to fullscreen mode? 

The in-game settings don't change anything other than stretching the small window screen into different proportions. 

[Duyy]

Can you screenshot the options page?

[ShinRaikdou]

Try alt+enter?

[The Last Melody]

Orcka, sounds like an issue with your graphic card settings. But please provide screenshot of options page before we say that for certain.