Take a look at the template and you'll notice that it's not intended to be used to create an exhaustive biography. Instead, it could be a good template for students to use to summarize a handful of key moments and events in a life of someone they've studied. I might have students use the template as a means to organize those key moments before writing a more in-depth biography.
Take a look at my playlist of 51 Canva tutorials to learn more about how to use and share designs made in Canva.