Hi,
Thanks for contacting us.
To make your site as per demo https://themagnifico.net/eard/smart-cleaning/, please refer below to the documentation for a better understanding.
Please take backup of your site if any data is available before activating our premium theme.
Here is the link: https://www.themagnifico.net/eard/wathiqa/smart-cleaning-pro-doc/
We hope this gives you the information you need.
Please let us know if you need anything further and we would be happy to help.
Many Thanks