Modify the Caption style. Here's one method: In the Styles pane
(Ctrl+Alt+Shift+S), click the Manage Styles button. On the Edit tab, locate
Caption and click Modify. In the Modify Style dialog box, make the desired
changes. Click OK. If you want to transfer the modified style to the
attached template, be sure to select "New documents based on this template"
before clicking OK in the Manage Styles dialog. If/when you are prompted to
save the template, choose to do so.