Every Pages template comes with a default text box style, so when you add a text box to a document and type text in it, the box and the text use this style. You can modify this default style—change the font, font color, color fill, and so on—then make it the new default style for the document. Your default text box style applies only to the document where you create it.
Add a text box to your document and change it however you want.
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Click the text box to select it.
Choose Format> Advanced> Set as Default Text Box Appearance (from the Format menu at the top of your screen).
You can change the default text box style whenever you want, and it won’t affect any text boxes already in the document.
If you want to apply the same design changes to other text boxes that already exist in the document, you can save the default text box style as an object style, then apply the object style to other text boxes.