Keep in mind: You need to have Root access as you can't access it through the WHM Reseller Account.
Here's how you can disable the cPanel account features that cannot be overridden by another feature list so that your client/reseller won't be able to enable them.
1. Log in to your WHM Account.
2. Go to Packages >> Feature Manager or type Feature Manager in the menu filter box.
The option Feature Manager will appear. Click on it.
3. Under the Manage feature list, select the Disabled option from the drop-down menu.
4. To disable any feature, check the options you want to disable. After that, click on Save.
So now these selected features can't be enabled or overridden by other feature lists.
