I found this in Help.
QuoteNormalFont property
(Formerly known as global function SetNormalFont, which is now obsolete)
static FontType Game.NormalFont
Gets/sets the font used for all in-game text, except speech. The font number must be a valid number from the Fonts pane of the editor.
More specifically, AGS uses the Normal Font for the following:
Display
DisplayTopBar
dialog options text
the built-in save and restore dialogs
The Normal Font is font 0 by default.
Example:
Game.NormalFont = eFontSpecial;
will change the normal font to the font "Special".
They are menus that show up when you call SaveGameDialog(); and RestoreGameDialog();. They provide a simple UI to save and restore games, so that you don't have to make your own.
There's also QuitGame(1); which shows a "Do you really want to quit? Yes/No" message box.
Really) I was stupid.