The Appearance Options dialog sets preferences for the overall appearance of Kaleider.  The default Kaleider Original Interface Style, with colors on a dark background, can be difficult to see on some display monitors, or even hard on the eyes.  In such cases, the Interface Style can be switched to Standard Windows, which provides a lighter, more conventional appearance.  The Raised Buttons option will show buttons as 3D boxes.  The display Background Color can be chosen.  The size of text, buttons and other controls can be adjusted by switching the Interface Scale from Normal to Large, Jumbo, Huge, Enormous, Gigantic, Colossal or Super.