Hi Sarah,
The Archive page of Explore is built through three Elements.
1. Block Element – Content Template. Reference: https://docs.generatepress.com/article/block-element-content-template/
There’s a video in this link showing how to create one. There are also templates you can use: https://share.getcloudapp.com/RBuBm1AJ
2. Block Element – Page Hero. Reference: https://docs.generatepress.com/article/block-element-page-hero/
The one used in Explore is pretty simple, relying on a GB Headline Block and a GPP Dynamic Content Block.
3. Block Element – Archive Navigation. Reference: https://docs.generatepress.com/article/block-element-archive-navigation/
There are also templates that can be used for this. You can use one, and then simply edit how it looks.
Another approach to get the design of the Explore Template is to Import the template on a test/staging/mock site, and then export Elements “Archive Cards”, “Archive Hero”, and “Archive Navigation” through Tools > Export. Then, Import these Elements to your Live site.