You can tell Excel to automatically fit the text in a cell to the width or height of the text, go to the top of the window, and click Format. When the Format menu appears you can click Autofit row ...

Fortunately, Excel is flexible enough to handle long text in several ways.To bypass the ribbon interface to apply Shrink to fit, press Alt, H, F and A. Doing so will open the Format Cells dialog ...

1. Select the cell with text that’s too long to fully display, and press [Ctrl]1. 2. In the Format Cells dialog box, select the Shrink To Fit check box on the Alignment tab, and click OK.