In PowerPoint, when you type, you may notice that if you enter more text than can fit inside a text placeholder, the text is automatically resized to a smaller size. This is called AutoFit. In some cases, that might be helpful; in other cases, it might not. Here’s how to turn that off.
The best case for turning off AutoFit is when you know how big you want a box (or any shape) to be on your slide and you know the size you want the text to be. In that case, it makes more sense to let the text overflow the box so that you can edit the text down to a point where it fits.
AutoFit Options
First, let’s take a look at what happens when you type inside a text placeholder. If you type more than will fit in the placeholder, the AutoFit Options button displays. Click on the “AutoFit Options” button to view the available options.
In this example, the “AutoFit Text to Placeholder” option is selected.
To turn AutoFit off for the active text box and allow text to move beyond the placeholder border, click “Stop Fitting Text to This Placeholder.”
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Source : How to Prevent PowerPoint from Automatically Resizing Text
