Select Effect
Click Add Effect>Select or right click the element selected and choose option Add Effect in the context menu to open the Select Effect dialog.
The dialog is divided into two columns. On the left is the effect list, which is classified into three groups, named Entrance, Emphasis and Exit respectively. On the right is the effect preview window.
Preview: Checking this option, you are seeing its preview on the right window while you are selecting an effect. Otherwise it is not.
BG: Set the background color of the preview window.
Text: Set the text color of the effect.
Option: Click the button to open the Preview Options dialog, where you can set the preview settings.
OK: Click the button to apply a selected effect to a selected element on the canvas.
Cancel: Click the button to cancel the action.