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You can change the font size in the Preferences > Form Styles wizard. Here's a guide:
1. Click the "Preferences" button in the toolbar.
2. Click the "Form Styles" text link in the Preferences menu.
3. Go to the "Styles" tab and then enter a bigger value in the "Font Size" field.
4. Click the "Save Changes" button when you're done.
Hope that helps. Thank you.