How to display an active ruleset in a combobox?

In our application, we have a small bar with settings. We're currently adding the ability to save multiple rulesets of settings that the user can easily switch between.

I've added a simple combobox with Add, Delete and Rename buttons to create a new ruleset. The selected ruleset will be the active one.

Example Mock up:

Now here's my issue. If the user wants to edit a ruleset, he first has to change it to the correct ruleset, which will make that set active, before he can edit it. But what if the user doesn't want that set active at the moment and just wants to edit it?

My immediate thought was to add another button "Set Active":

But how do i indicate which set is active? I'd imagine that adding an indicator in the combobox would not make it very transparent.