HI @Morghan ,
Do you want to enable multiple options within the "What do you need?" field data card (DataCardValue14)?
Based on the needs that you mentioned, I think it is not necessary to create a Rule to achieve your needs. Please consider take a try with the following workaround:
Set the Visible property of the Envelope Type_DataCard1 in Edit form to following:
If(
"Envelopes" in DataCardValue14.SelectedItems.Value,
true,
false
)
If you still want to create a Rule to achieve your needs, please modify the formula within the Condition box of your Rule as below:
"Envelopes" in DataCardValue14.SelectedItems.Value
Please consider take a try with above solution, then check if the issue is solved.
Best regards,