After you enable " Smart group" , you will see the "App Discovery" bar in each folder showing a list of recommended and popular Apps.
You can install these apps from here instead of searching for them in the Google Play Store.
1. To use "App discovery", please first go to "Preferences"--> "Folder/Icon"--> change "Folder style" to "Full screen"
2. Please update ZenUI V2.0.0.9 or later version for supporting "App discovery"
Q&A:
Q: Does "App Discovery" use any Android internal memory space?
A: Similar to the Google Play Store, some internal memory will be utilized for App Discovery.
Q: Can I disable "App Discovery" ?
A: Go to "Preferences"--> "Folder/Icon"--> enable or disable "App Discovery"