Timeline HELP

So i was in my time line view and I or a cat hit a key that changed the timeline view to only one drawing and the cells that one drawing is in the project. I can not see how to get back. Alt Z is no good. If i close the Program but that is not a good way to do it,

Thank you……

In the text hierarchy for the Drawing layer do you see a minus sign next the the highest item in the list? Clicking on that should take you up to the next level.