I just started customizing the theme, so I haven't done anything heavy, yet. But it seems as though the theme is using flexbox, it's based on Magento Blank, and it's using a wide layout. I specifically put into the theme's theme.xml file the following line of code, so it inherits from Magento/blank.
My question is, how do I get this to use a boxed layout? I don't want to reinvent the wheel and start doing break points, and all sorts of stuff. To me, that should've been included in the base Magento Blank theme, right?