Footer

Footer element is placed inside .main-content and next to .page-content and you can see the structure in this file:
views/layouts/dashboard/footer.hbs

html

<div class="footer">
  <div class="footer-inner">
     ...
  </div>

  <div class="footer-tools">
      <a href="#" class="btn-scroll-up btn btn-dark">
        <i class="fa fa-angle-double-up"></i>
      </a>
   </div>
</div>

You can also put .footer-tools and .btn-scroll-up outside of .footer, in that case if you have a boxed layout, the button will appear outside of .container area

On page load, .btn-scroll-up elements are enabled to scroll window to top on click.
But you can use acrScrollTop function to add this functionality to any other element:

$('#my-button').aceScrollTop()

The bottom toolbar in mobile view is also a footer which is shown only in small devices by applying d-sm-none class:
Mobile Footer