A Tantot Extra

Help & Support - Display Settings

À Tantôt will display correctly with most display settings, although does require a minimum resolution of 1024x768. Although resources scale to fill the screen, menus may not be displayed correctly on lower resolutions.

You can learn more about changing your display resoltion here.

Full-Screen Browsing

To use your whole screen for resources, most web browsers support a full-screen mode. With compatible browsers this can be toggled by pressing the F11 key.