Temporarily turn off text AutoFit
When text AutoFit is on, the AutoFit Options button appears to the left of the text the first time text is resized.
- Click the AutoFit Options button.
- Click Stop Fitting Text to This Placeholder.
The spillover text is not resized, and text AutoFit is off for this placeholder, for the current Microsoft PowerPoint session. However, this doesn't affect the AutoFit setting in the AutoCorrect dialog box.