The default text style in a drawing is defined by the active drafting standard. 
- Click Manage tab  Styles and Standards panel Styles and Standards panel Styles Editor to open the Style and Standard Editor. Styles Editor to open the Style and Standard Editor.
- In the dialog box, select a standard to base the style on. 
- Select a style name from the list, or select New to create a custom text style. If you create a style, Inventor copies the default text style. 
- Rename the style with another name. 
- Set the text format by making selections in the dialog box. 
- Save the new text style and close the Style and Standard Editor.