Hello,
We have checked your given link,
Actually you has not set up the theme home template that’s why it’s not showing like our theme demo,
First of all, you need to setup Homepage

Step 1: Just edit your homepage and set that Page template as a “Homepage Template”

Step 2: Go to Dashboard >> Settings >> Reading, select “Home Page” as a front page.

you may follow our theme documentation for that, please check below link
https://luzuk.com/demo/niwas-resort-hotel/documentation

Thank You