Off-canvas global sections are blocks of Elementor content that should be used to display various type of content into an animated side panel.
Access Rey theme > Global sections and create a new one, and make sure to check the “Off-canvas panel” option. After entering Elementor edit mode, you click on the Page settings button( bottom left Gear icon) and configure the offcanvas panel as you want to. Afterwards you can start adding elements.
Screencast video here https://d.pr/v/6jt9fE .
To activate the offcanvas panel in frontend, you will need to make use of the Navigation Trigger element. In this element you can select, how the trigger should look like (as a hamburger icon, general icon or even a plain simple button).
Screencast video using Nav. Trigger element https://d.pr/v/J98UnL .