If you want to build your header or footer using Elementor, you will want to use this plugin Header Footer Elementor.
To use it in a proper way you have to disable theme header or/and theme footer. To do it go to:
- For theme header – Appearance → Customize → General settings → Theme Header.
- For theme footer – Appearance → Customize → General settings → Footer.
This plugin is supported since Rife Free/Pro 1.8.3.