Field selection in plan gets all existing custom fields.

In the plan view in Portfolio, if you want to select a specific field to appear on the scope you must click on the ellipses button on the fields column. The issue here is that this dropdown to select the fields loads all the existing custom fields on the instance.

One of the problems is that the "Add Custom Field" button is on the bottom of the list so you must scroll down through all the fields to get to the button.

The suggestion is to make Portfolio only show fields related to the projects/boards that are the source of that plan.