You can format all the titles at once from the Photo Page tab of the Photo Gallery Properties Editor, or format individual titles on the individual photo pages.
Note:
If you specify formats and they do not appear in the text, it could
be caused by the text style definitions, usually the definition of the
Body and Normal(P) tags in the SiteStyle. For example, if the Body tag
defines the font size, that definition overrides any font size you specify
in the Object Format dialog. You can get around this by choosing a SiteStyle
that does not define the property you want to set, or by formatting the
individual photo titles. See "Formatting an Individual Photo Title”.
Any individual text you format overrides the SiteStyle definitions.
In Page view, display the thumbnail page or a photo page of the gallery you want to work with.
Open the Photo Gallery Properties Editor.
Display the Photo Page tab.
Click Format Title.
The Object Format dialog appears.
Set the text format. See Formatting Text.
You can apply formatting to all or part of the title text. For example, you can make a single word bold for emphasis. Formatting you apply here is also reflected in the title text on the thumbnail page.
In Page view, display a photo page.
Click the Next 
button on the control
bar until the photo you want to work on appears.
Select all or part of the title text.
Use the options on the Format tab of the Title Properties palette to format the text. See Formatting Text.
