Remove Scroll to Top Arrow in the right side bottom of the website.

To remove the scroll to top button in the bottom right side of your website:

#scrollUp {display:none !important}

or to move it to the left side:

#scrollUp {
  left: 18px !important;
  right: inherit !important;
}

For mobile only.

@media (max-width: 767px){ #scrollUp {display:none !important} }

The code can be added into your child theme, or in the Dashboard under Appearance > Customize > Additional CSS.