All of the outline styles that ship with ClarisImpact are set to have different text sizes on different levels. You can easily change that so that all of the levels have the same text size, and save it as a model style to use over and over.
To make the text the same size on each level:
1) Create an outline
2) Go under the Outline menu to Level Settings.
3) In the Level Settings dialog, hit the Select All button. This highlights each level.
4) Set the size to your desired point size.
5) Hit Done.
To save the style:
1) Go under the Outline menu to Model Styles.
2) Hit the Add button.
3) Type in a name for your new style.
4) Hit Rename.
Now, each time you make a new outline, ClarisImpact will bring up your style as an option.