Trying to edit the Home 1 Slider with Elementor, you'll notice that it's a Tabs element and each tab contains an Elementor template:
The easiest way to access these templates is to mouse-hover the "Edit with Elementor" link on the top Toolbar and locate the Home 1/ Slider/ Slide 1:
Clicking on it will redirect you to the template's content:
You can also access the templates from Dashboard > Templates > Saved Templates:
Make your customization, following this guide: Guide to Vamtam Elementor Builder