Importing Sample Data and Copying a Demo (video)
If you're the type of person that would rather just make a copy of the live demo, opposed to following the steps in the general overview, then a big sample data import might be the way for you.
Within your download package, you can find any included sample content within the folder named /sample-data. In here, you will find an XML export file for any live demos your theme offers.
Note: Do not confuse the sample content we refer to here with the concept of "Sample Layouts" of the Layout Builder. Sample Layouts in the Layout Builder give you a starting point when you create a custom layout and is a completely separate topic, which doesn't require importing any files.