Can We Force a Demon to Be Absolutely Silent When It Leaves?

There is no Bible evidence that we can.

Even in Mark 1:23-26, where Jesus commanded the demon to be quiet, the demon “cried out with a loud voice” when it left.

The command to be quiet was effective in getting the demon to stop talking, but it still made a racket on the way out.  Therefore, we should expect that we can make a demon stop talking, but it may make noise when it leaves.