yerg1
You can go to file: /templates/buildr/tpls/blocks/scripts.php
At approx line 41, you will see this class:
class="hidden-phone zen-fixed zen-scroll-top btn"
then remove the class hidden-phone
The back to top button will show on mobile then.
For the issue of secondary menu, I'm not entirely sure of which menu you're referring to, could you share some screenshots?