Thanks for help!. it worked. We didn't know it was a setting!.
What do you mean by using container-fluid? The classes you see in the image are from when we created the project using your instructions.
We can't find anywhere to change them.
Is there a way to extract these files into the project so we can edit them? For example, there is no MainLayout file in the project. If we remove class="lpx-content" in the browser's developer tools, we get the look we want.