Problem with WordPress

Good afternoon, I created a header using the Elementor header plugin, I chose in the settings to show on all pages of the site in the page settings I chose the Elementor Full Width template I chose the same template on the main page, when I go to the main page there is no empty header sheet🤷‍♂️Before that I succeeded I can fix this somehow, but I don’t remember how, but another problem arose when I clicked on a website link, an empty sheet, but when I went through Google Chrome there was a header, I don’t understand how it works. I think there’s some simple answer here since I just started learning WordPress .I ask for help 🙏