Located next to the Navigation bar, the Browse pane lists the built-in Views and Personal views, and also lets you access the Tree view:
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Built-in Views are default entry points for browsing objects in your AD and Azure AD environment. Personal views, on the other hand, are filter or search queries that you can build and save to use later.
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The Tree view helps you browse AD and Azure AD objects via the hierarchical directory tree structure of the containers.