Override Basic Actions for Activity
By default, when a user opens any CT CPG Activity record, the standard page will be displayed. To launch the Activity Report page instead of having a standard Salesforce page, override the behavior of the New, Edit, and View buttons:
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Go to Setup → Object Manager → CT CPG Activity → Buttons, Links, and Actions.
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Click Edit next to the Edit label.
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In the Override Properties section, select Visualforce page and ActivityReport [CTCPG__ActivityReport] next to Salesforce Classic Override.

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Click Save.
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Repeat steps 2–4 to the New and View buttons.
The setup is complete. Now, when you click one of the buttons above, the Activity Report page will be open.
