In previous versions of Squarespace there were many different template 'families', each with with their own advantages and challenges. Each had different features.
On Squarespace 7.1, there are over one named designs to choose from but they all use the same template and so all have the same features. They only differ in the demo content that has been created and the way a designer has styled them using different colours, fonts and options.
As they all share a common feature set (a single 'template') Squarespace doesn't have a way to swap from one initial design to another. You can reset the template's style tweaks to their original colours, fonts and other styles in the Site Styles panel, but you cannot reset demo content.
I appreciate this isn't what you want to hear but please bear in mind that this is a 'peer-to-peer' forum where Squarespace users help other users. Squarespace doesn’t use this forum to track feedback or requests (see the guidelines - item 7). To make a feature request and ensure it is seen by the right people at Squarespace, you can do so via Squarespace Customer Support using a support ticket. Circle members can go here.
Regarding your specific issue, you can start again with new demo content and a different design by starting a new website trial. As you've already paid for a website subscription you will need to cancel this and subscribe again on your new site. You can then use this form to request a prorated refund from Squarespace Customer Support.
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