Importing Site Backup Does Not Carry Over Mobile Responsive Design

After attempting to export an existing site that I plan on using as a template for future sites, I noticed that none of the mobile responsive design of the original project is carried over into the new project where I imported the template.

Please view the screenrecording to see how this looks on my end:

Hope that this is something that can be made to work soon because getting everything working pixel-perfect on every resolution has taken me what feels like an eternity and the thought of loosing all that makes my head spin.

Thanks.