How do I Undo combine command when returning to site to fix error

I have combined all parts by using the combine command and completed a sign. After leaving the Easel site I realized that I had made a mistake. I went back into the site and of course it showed that it was all combined. I can not figure out how to undo the combine command and fix the mistake after I have exited and returned… I tried the explode app but that didn’t work. If you combined all parts and are still creating you can remove the combine with a return and remove but I haven’t found a way to do it when you go out of the Easel site and then come back. The remove will only remove the whole combined sign not a small part. Can anyone who knows Easel tell me what I do to break up the combine process so I can fix the mistake.

Highlight your combined project and open the exploder app. There follow the steps in the app and you will have everything as individual items again