Symptoms
When creating or editing a feature list using the WHM >> Feature Manager page, you may see an option grayed out.
Description
In WHM >> Feature Manager you may see an option grayed out with a red "Disabled" warning next to it, such as in the image below:
When this happens the feature has been included in the "disabled" feature list, which makes it disabled for all users globally and keeps it from being applied to new feature lists.
Workaround
If you'd like to change that behavior, you can go to WHM >> Feature Manager and choose the "disabled" feature list to edit what features are being restricted.