Thanks for sending your website URL.
We have checked your website link and found that you have successfully install our Businesswp Pro theme package on your site.
Your question is customizer option panel is empty. Can you share your website login details on our email address [email protected] then we can check your customize option panel on our end. Then we can resolve it our end.
You can read about to customize front page sections demo contents. Here is the link https://helpdocs.britetechs.com/docs/businesswp-pro/front-page-section/how-to-setup-section-slider/
Let me know this documentation link will helpful for you.