Hi,
To achieve this follow these steps;
1. Activate the expert mode in UI to see the tiny spanner symbol.
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if you dont find that icon then enable configuration mode using 'Personalization'
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2. Now click on the Spanner icon
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3. Click on the Blue area
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4. in the pop up select Contact Person filed and chose remove button
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5. Save and Close
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That's all
Cheers,
Vivek