Allow Script Debugger to Control an app

I opened the Keep It app dictionary in Script Debugger on Mojave and the typical “allow Script Debugger to control…” message popped up. (Annoying nattering from Apple.) I inadvertently clicked “Deny” instead of “Allow”.

Is there a way to reverse this?

It should be listed in System Preferences, Security & Privacy, under the Privacy tab. Click on Automation, and it should be listed under Script Debugger. Once you turn it on, you will probably need to relaunch Script Debugger to see the result.