New tab while sending email notification.

on the Process Model -> process Variables -> remove form.

which version are you working on?

We might need to know more about your specific setup so far.
Is the form you're using already part of a process? When you say "I have the new process starting", do you mean that the rich text icon is being used with a!startProcessLink(), or something else? If the original form is already in a process, have you considered making the email icon a submit link? Or perhaps using a!startProcess() which should initialize an asynchronous process call and not cause the user to see an extra form?
Let me know if any of my guesses are close - otherwise we need as much more detail as you can provide. But as always my first and foremost advice is to just play around with the different options available to you and see what different things do.

Hi Saicharan,

which link you have configured in richdisplayIcon. Can you please provide your inputs to Mike Schmitt queries.

Thanks,
Sindhu

Working on 18.3 version

it is standalone interface , not part of any process.
Yes on click of richtext icon, a!startProcessLink() is called, which has send email notification node.