You can use the "Edit file" function to view, add and remove all participants in the file. Navigate here to the list of all files for the desired client. At the very end of the line you will find the context menu (icon with 3 dots). As soon as you open the context menu, you will find the "Edit file" option.
2. button "Add participants"
The sidebar now opens with all relevant information about the file. Among other things, you will find the "Participants" section with the "Add participants" function:
3. settings
You can now add further parties to the file:
Add participants: The list of all your clients is available here
Relation Side: Select here whether the participant is acting on the customer side, on the opponent side or as a neutral entity
Role: Select the role here, e.g. client, co-client, opponent, ...
4. the party involved was added
What types / roles of participants are there?
The following roles are currently available for you to choose from: