A topic style is a set of formatting attributes that can be saved with a unique name, and repeatedly applied to topics. Topic styles are saved with the map, and can be saved in a Style Template for later re-use.
Creating a named topic style makes a distinct set of formatting attributes easily available, and the topic style can easily be applied to many topics (in contrast to using the Format Painter, which is suited to copying the format from a single topic to another). The formatting of a topic style can be modified, and all topics using the style will reflect the new formatting.
The map's style, including its topic styles, can be saved in a Style Template and re-used on other maps.
Topic styles can be applied and managed from the Topic Styles pane. You can also apply topic styles from the Style group on the Home tab, and on the Format tab.
On the Format tab, in the Styles group, click Topic Style, then click Organize Topic Styles.
On the Status Bar, click Task Panes, then click Topic Styles.
What do you want to do?