If you are a kintone administrator, you can manage apps and app templates from the pages listed under Apps in kintone administration.

On the App management screen, you can view the usage status of apps created by users. From the list of apps, you can open the App settings screen of each app or delete a specific app.
Actions you can perform on the "App management" screen

This section also provides information on how to restore deleted apps.
Restoring deleted apps

On the App templates screen, you can create app templates, export a created template to a file, or import an app template from a file.
Managing app templates

This section also provides information on settings that are not included in the app templates. It is recommended that you read the information before you start creating app templates.
Settings that are not included in app templates