I have created a form in Power Apps as below:

The form should show all the zones for the operations selected in the Operations field.

However, currently the form only shows Zones for only 1 Operation selected in the Operations field. When multiple operations, the Zone field only lists the zones related to the first selected operation.

I am using the following code in the Items property for the Combo Box for Zones
If(
ddselection.SelectedText.Value = “Zones”,
Switch(
First(cboperations.SelectedItems).Value,
“Operation 1”, [“O1Z1”, “O1Z2”, “O1Z3”],
“Operation 2”, [“O2Z1”, “O2Z2”, “O2Z3”, “O2Z4”, “O2Z5”],
“Operation 3”, [“O3Z1”, “O3Z2”, “O3Z3”, “O3Z4”],
[]
),
[]
)

But this code does not show all zones related to the selected operations in Operations field.