Not sure what you have done, but you can disable the standard supersite navigation controls in v17 and replace them with your own menu. That way you can have a main page with links to other pages from within a main page.
The code to disable navigation is borrowed from the from another thread on the ultimate supersite slider and goes in the website HTML. You still might see the navigation control popup, but it does have a don't show this again option.
HTML Code:
<style>
<style>#xr_pnava{display:none !important},#xr_pnavp{display:none !important},#xr_palrt{display:none !important}
</style>
<script>
(function(){if(typeof(xr_prinit4)=="function"){var o=xr_prinit4;xr_prinit4=function()
{o();if(document.onkeydown==xr_prku)document.onkeydown=xr_d_old_onkeydown;};}})();
</script>
The attached example uses Export option Scale-to-fit-Width, but the answer to your second question is down to your mobile design- that's for you. Vertical scrolling is a better option for portrait mobile.
For info here is a link to a supersite slider demo https://initiostar.co.uk/demo/Cube/#xl_xr_page_index-b.
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