Hi @kiat87,
Thanks for writing in!
Your homepage is using the default page template. To make sure that you have a fullwidth page content, please edit the page and use the Blank - No Container | Header, Footer page template. To know more about the different page templates in the theme and how it works, please check this out:
To remove the shadow and border of the header and footer, you will need to edit the header and the footer itself. The shadow and the border can be remove in the bar settings.
We would loved to know if this has work for you. Thank you.