When creating a custom field, the "Editable Choice List" states that the field allows user to "Choose multiple values from a pre-defined list of choices." However, this is counter to my experience creating a field of this type in AHA and what I read here: https://support.aha.io/hc/en-us/articles/202000937-Add-custom-fields-across-Aha-
If this is the case then this label should be updated to reflect that the user can only select a SINGLE value.
I agree - I have the same experience and would really like to be able to select multiple options from a pre-defined list.