First enter your own home, and then enter home construction mode.
When you come to the home editing interface, without selecting any objects, click Export Blueprint in the upper right corner to export the complete blueprint. If the export is successful, you will see the file name and path of the blueprint, and you can click to open the file. folder to quickly find file locations.
After finding the file, we can rename the file to a name that is easy to identify. The extension of a complete blueprint is ".blueprintx".