hey man, I faced the same problem today. Its solution is as below
1. go to elementor page builder where you are editing your site with template
2.in the left bottom corner you will find a setting icon, click on it, its the page setting option.
3.set the page layout say default, yours must have been set to elementor canvas.
4. click update.
5. say thanks to me (just kidding) ?? ?? hope the problem is solved