On the
Home tab or on the Format
tab, in the Formatting group,
click Clear 
.
You can remove the formatting that you have applied to any map object and return it to the automatic style settings.
Select the object or the text within a note or topic.
You can select multiple objects to clear the formatting for them. Press CTRL+A to select all objects on the map, or all the text within a note.
On the
Home tab or on the Format
tab, in the Formatting group,
click Clear .
Press CTRL+SPACE.
