The Mobile Data Management feature in Hexnode lets you set the limit for Mobile Data that can be consumed by an app. This limit can also be set to 0 MB.
Create a new policy or choose to edit an existing one. Navigate to Android–>Mobile Data Management–>App-wise Restrictions. Click on +Add App and choose the desired app. Click Next. You will have the option to Block Mobile Data/All Network Connections and set the limit of Data Usage by the chosen app. Please note to associate targets and save the policy.
Kindly use the help link for a reference on Mobile Data Management.