To copy all the field values to the cloned records, add the field to the page layout.
To add fields on the page layout:
First, we need to find and open the page layout.
In Classic, for standard objects: Go to Setup | Customize | Click the object name
For custom objects: Go to Setup | Create | Objects | Click the object name
In Lightning: Click the Gear icon then go to Setup | Object Manager | Click the object name
Click Page Layout.
Drag the required field from the palette and drop it on the the page layout wherever it needs to be placed.
Click Save to finish. Alternatively, click Quick Save to save and continue editing the page layout.
Once added to the layout, clone the record verify the field gets copied over.
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