Hi all,
I’ve had the same issue and here’s what worked for me.
If Hello Elementor is the default theme, go to Appearance and click Theme Settings. Then, I toggled (on) “Disable cross-site header & footer”.
I had a few hiccups, when editing the header. After loading the template, it would serve an error saying it could not be loaded. What I did was redo the edit by clicking on pencil icon and changing page layout to Elementor Full Width FIRST before loading the template itself. So far so good.