Save activity groups


I am quite new to Celonis, so perhaps this is a stupid question. I am investigating a process with a lot of different activities and a huge number of variants. To make some sense of it all, I am grouping a lot of the activities. However, whenever I close the analysis and reopen it later, the group definitions are gone and I have to redo all the work. Is there a way to save the activity groups?

Thanks for the support!