Which version of Acrobat are you using? What do you see in the menu when you right-click? There are different things that people call "text box", I assume you are talking about the "text box" annotation that you can find under Comments>Markup Tools
In order to find the menu item, you need to have the whole text box selected - you need to see the resize handles around the text box. When you now right-click, you should see the "Make current Properties Default" option.
Karl Heinz Kremer
PDF Acrobatics Without a Net
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