Just click on whatever option you used to bring up the dialog box before it disappeared. The dialog box may still be open, but has lost focus. When you open it again, you really do not open a new box, you just are able to see the box that already is open. Most open windows show up on the bar at the bottom of your Windows screen, but many dialog boxes are not programmed to indicate that they are open.
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Ctrl - 1 - A will open the Alignment Tab in the Format Cells dialog box.
If a menu item has 3 dots after it, known as an ellipsis, clicking on it will open a dialog box.
Ctrl - 1 opens the Format Cells dialog box.
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Crtl+f1
You can click on the little arrow in the bottom right of any of the groups on the ribbon to open the appropriate tab of the Format Cells dialog box. On the keyboard Ctrl - 1 will open the Format cells dialog box.
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CTRL+1