Participants of a data record are saved separated by a comma in a text field with a restricted length.
This text field can e.g. be displayed in a list view.
This field is also searched if you go to Advanced search or work with a dynamic filter and create a condition with the Participants field.
If many participants are entered for one data record the length of the text field might not be sufficient for all participants. Thus, not all data records of all participants might be found.
The list view then displays data records of the selected users which also meet the filter conditions of the Filter tab.
The data records of all selected participants are searched.