Hi @Anonymous ,
Could you tell me:
- Do you have a person column in list?
- Does the person column support multiple selection?
If my assumptions are correct, Please try the steps below:
1\ Set the Items property of combo box control to:
Choices([@LIST77].TestPerson)
// LIST77 is the name of my list. 'TestPerson' is the name of my person column.
2\ Set the Update property of Person datacard to:
DataCardValue8.SelectedItems
// DataCardValue8 is the name of my combo box control.
3\ Set the Default property of Person datacard to:
ThisItem.TestPerson
// The premise is that you set the item property of the form
4\ Set the DefaultSelectedItems property of combo box control 'DataCardValue8' to :
Parent.Default
5\ The result is as follows:


If the problem still cannot be solved, please provide your errors/ formulas / controls / pictures.
Best Regards,
Wearsky
If my post helps, then please consider Accept it as the solution to help others. Thanks.