There are two types of Theme modes available in the theme, You can select any one option to create your website.
Go to Appearance => Customize => Theme Mode
You can select one option at a time either Advance Mode or Legacy Mode.
Advance Mode (Elementor Based)
In advance mode, you can import the demo dummy data with just one click and edit the content to build your website, and also you can use some customizer settings like header, footer, etc.
Legacy Mode (Customizer Based)
In Legacy mode, you can customize your website, and also you can use all customizer settings to edit the content.