App.GUI handles the GUI related settings List of variables:

Variable name	Variable type	Description	Default (Phun beta 4.20)
autoGlue	true or false	if objects should automatically be glued to the background	false
dragUndo	true or false		true
drawHingesWhenRunning	true or false	If hinges should be visible during the simulation	true
freeDrawing	true or false	If it should be possible to draw inside objects	false
leftClickMenus	true or false	If left mouse click opens the menus	false
simpleMode	true of false	If the phun menus should have advanced features listed	false
trapUser	true or false	traps the user to only use phun	false
zoomFactor	decimal positive value	The amount your zoom increases when zooming in and out	0.2