Design/Choosing a menu
From Shopnix Help
What is Theme ?
By using theme you can change the look of your store.
Where will I get theme feature ?
Go to store manager > SETUP > THEME
There are 3 tabs i.e. Theme, Customize and Home
Now come to the Customize tab
The first option that is Vertical Menu Enabled ,this option enables vertical menu and disables horizontal menu. By default it is horizontal menu.
In the store's page
Now checked Vertical Menu Enabled option
Now the store's page will be
In this section you can upload you own background image, you can set your own background color.
You can upload the image by clicking on the 
button.
If you have more queries or would like assistance with this please contact us on support@shopnix.in.