Want your text to stop automatically resizing itself in your PowerPoint slides? You can turn that behaviour off in your AutoCorrect options. Click the Microsoft Office button, and choose 'PowerPoint Options'. On the lefthand side of the box that comes up, click 'Proofing'. At the top, click the 'AutoCorrect Options...' button. Click the 'AutoFormat As You Type' tab, and uncheck 'AutoFit title text to placeholder' and/or 'AutoFit body text to placeholder' (choose title or body text as needed). It will now stop changing your font sizes to fit to their placeholders.