Schedules do not use layer combos. You can safely ignore the (locked) combo name. But, if it bugs you, as I recall, the combo shown there is whatever combo is active when the schedule view is created. So, just activate the view, change combos, and update the view settings.
Cheers,
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Ventura 13.7, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB