Hi Subramanian,
Thank you for using Syncfusion controls.
We have checked your reported scenario with MetroForm. But unfortunately, we did not get any white line from the form please check the image and sample,
We have tested with Syncfusion version 18.1.0.48.
Please check the above sample and revert us if you still facing the same issue? If yes, please modify the sample based on your scenario. It will be helpful for us to check on it and provide you the solution at the earliest.
Regards,
Susmitha S