The Font and Font Size buttons below the Layout button allows you to adjust the text size of questions:
Click the Font button and select your preferred font for your question text. The default setting is Arial.
Click the Font Size button and select the appropriate text size for the question text. Valid settings are 9 point, 10, 12, 14, 18, 24, 36, 48, 72, or 96. The default size is 36. You may also choose to automatically size the text to fit the text box by clicking on the icon below the Font Size button.
You may also adjust the style and justification of your text.
To make your text Bold, click on the B icon below the Font box.
To make your text Italic, click on the I icon below the Font box.
To underline your text, click on the U icon below the Font box.
To center your text, click on the Center icon to the right of the style boxes.
To left-justify your text, click on the Justify Left icon to the right of the Center icon.