Add the Manage Targets Button
Add the Manage Targets button in Lightning Experience to the Accounts and Contacts tabs.
To add a button:
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Go to Setup → Object Manager → Account (Contact) → Search Layouts for Salesforce Classic
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Click Edit next to List View.
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Go to the Custom Buttons section and add the Manage Targets and Mass Manage Targets buttons to the Selected Buttons list.
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Click Save.
The buttons are added.
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In the Lightning Experience:

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In the Salesforce Classic:
