Not sure if this will help, but this is what I do to check for where a schedule is used within the different scheduling groups.
1 - I go to Schedule Groups
2 - I change the number per page to be 100, so I can see all the Schedule Groups without having to page through
3 - Then I just do I find on the page for the schedule I'm wanting to update
This seems to work well for me. Below is a screenshot of the steps.