Community Hub provides the ability to indicate how a page should be opened when users click it by setting a target for the button. For example: this allows Administrators to set whether a page should be opened in the same tab, or a new tab when the user clicks a button.
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In the Force.com App Menu, select Community Hub Setup.
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In the tab bar, click Buttons.
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Click Edit next to the button you want to customize.
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In
Target, enter the HTML Target value. -
Click Save.