In some situations, the Google Play prompts that the Theme APP is in high-danger status, and suggests you delete the Theme APP. However, the Theme APP can’t be found and downloaded back on the phone.
Here is a temporary solution to get back the Theme APP:
Go to [Settings] >> [Apps] >> [Manage apps] >> tap the three-dot icon at the upper right corner >> [Other settings] >> [Reset app preferences]. You need to give permissions for some apps after resetting app preferences.
Note:
If the home screen does not have the app drawer, the Theme APP will be restored to its original position. Otherwise, it will be restored to the app drawer after restoration.