Changing new type hierarchy defaults
New type hierarchies can open in a Hierarchy view or in a Java Hierarchy perspective. You can indicate which is the default method for opening new type hierarchies on the
preferences pages.
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Select Window > Preferences, and select the Java category. The general Java Preferences page opens.
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Use the radio buttons that appear under When opening a Type Hierarchy to indicate your preference.
Java development tools (JDT)
Java Base preference page