How do I find a Macro I've used or modified recently?
You can also click the ◷ button above the macro editor pane to select from recently modified macros, or use the ⌘ button to select from recently used macros."
manual:How do I [Keyboard Maestro Wiki]
I don't quite understand what populates the clock button at the top of the editor. I have a bunch of macros I have not modified in ages that show up in the modified button menu when I click and hold.
FWIW clicking and holding on the Used shows in order of used macros.