To exit the coordinator mode it is necessary to remove any existing projects and persons first. Make sure to backup any important information if you need the details at a later step.
To do exit the coordinator mode follow these steps:
Navigate to the "Entries" page of your submission
Delete the projects for every person you created via the three vertical dots next to "files" and "descriptions"
Delete the person via the three vertical dots next to "profile"
Now you can return to the regular submission mode via "Exit mode" at the top