Scroll To Top
From the dashboard, Go to Appearance > Customize >General > Scroll To Top for the top button.

Enable Scroll To Top
Check this option to enable the theme scrolling button.
Scroll Up Icon
Choose different types of scroll button icons.
Icon Size
Set scroll button icon size.
Align
Set different types of scroll button positions.
Side Offset and Bottom Offset
Set left/right and bottom positions for the scroll button.
Visibility
Set scroll button visibility on different devices.