A new feature in Keyboard Maestro 8 is the ability to Hide Disabled Macro Groups by selecting * Hide Disabled Macro Groups* from the View menu.
When you hide them, all your disabled macro groups will be consolidated into a single placeholder macro group.
This can be handy if you have a lot of disabled groups, test groups, half finished old projects, etc.
If you click on the placeholder, all the macros in all the disabled groups will be shown. If you select one of the macros, you can see the name of the macro group at the top right corner of the macro editor, and if you click on that macro group name, the macro group will be temporarily unhidden and selected. As long as the group remains selected, it will remain unhidden.
If you double click the placeholder, all the disabled macro groups will be selected and temporarily unhidden and selected. So you can then enable the macro group.
If you have more than a few disabled macro groups, consider turning this option on in the View menu.