Zeplin normally displays all the layers in your Photoshop file, even if they’re grouped.
If you want to keep certain groups together as a single layer, just write “-g- in front of the group's name or select the “Ignore sublayers of group” option from the Zeplin panel.
Check out the blog post, to learn more about this option: https://blog.zeplin.io/photoshop-open-beta-now-3f8f502fc4de
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