changing the look of main page on a mobile device

Hi Kriesi
see links below

how can i get my site to be set up like this one when using only a mobile device not an tablet?
i want to show my shopping page instead
with the menu showing above

https://d.pr/i/z3xd

https://d.pr/i/X3XT

or is there an alternative way to make your main page looks that a full menu and whne they scroll down a selected page is shown , in this case my shopping page?

or do i need a special code for it?

check this site on a mobile device

https://www.lorenhope.com

this is what I am looking for to happen

sincerely,

Jim