How to turn on Autostack Properties Dialog Box?

[aldus_wong]

I accidentially click the "Do not show this dialog" check box.
How can I turn the Autostack Properties Dialog Box again?

The normal way to call the Autostack Properties Dialog Box is,
1) you type "mtext" in the command line,
2) The multiline text dialog box comes out, in the typing area, type a fraction number, such as 1/2. then
3) You may highlight this fraction number, then right click for the shortcut menu.
4) in the shortcut menu, click properties, then the "Autostack Properties Dialog Box" will comes out.

[Glenn Pope]

When you right click on the fraction and click properties, I get the "Stack Properties" dialog box. When I click on the "AutoStack..." button, I get the "AutoStack Properties" dialog. There you can check off the Do Not Show setting.