The template has working Smooth Scroll plugin for pages scrolling. You don’t have to adjust anything as It’s on by default.
<main class="page-wrapper" id="js-smooth-scroll"> ... </main>
If you don’t want it, simply remove #js-smooth-scroll id from the main page wrapper.
Note: for the sake of good UX with your website for mobile users , Smooth Scroll is always OFF on touch devices.