Hi there,

Some page templates will not display the content entered in the editor. They just build the layout automatically based on portfolio items options (hero image, hero title, subtitle, background etc) and the options of the page having this template. These options are not configurable through the editor but in wordpress admin. WordPress platform offers the ability of showing the content entered in the editor by calling a specific function: the_content(). Elementor detects that the function is not called and displays a warning message.

if you want to go forward you can copy-and-rename the parallax page template (which is implemented in portfolio-parallax-panels-page.php), add the <?php the_content(); ?> call (line 80), modify the template name in the header and then add it to the child theme. This way will not be overwritten during a theme upgrade.