PowerPoint's default font or text type is Arial. However, you may want to change the font type, font size, and other formatting. Use the Formatting toolbar to set the color, size, and overall look of your text. It doesn't matter whether the text is an original slide or in a preset layout.
Here are some of the formatting options:
For more formatting buttons, click the down-pointing arrow at the end of the toolbar. Choose Add or Remove Buttons - Formatting. Choose any additional options you want on the Formatting toolbar. You can also choose Show Buttons on Two Rows.