Moving position of UIView which already setted by constraints.
You can change the position of UIView using it.
myView.frame.origin.x
myView.frame.origin.y
But if you already setted the constraints with storyboard, that has a priority so, you can’t see the result as you expected.

With the option “Remove at build time”, you can prepare to the constraint as manually.
And specify the value of constraints like below
myButton.trailingAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.trailingAnchor, constant: 15).isActive = true