View Tab

The View tab of the Ribbon Bar contains the ability to expand or collapse the Outlook Bar tree and change the Content Pane display.
View Tab

Tree Group

1. Tree Group
Expand By Level and Collapse By Level expands or collapses the Outlook Bar tree structure one level at a time. Expand All and Collapse All expands or collapses all levels in the tree. Expand and Collapse affect only the item selected.
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