When applying a Master feature to a feature, you have to scroll through all the products' master features if your product is at the bottom of the list. It would be great if the Master Features for the Product you are currently navigating were at the top of the drop down list.
Thank you for the idea. The epic selection field now displays the epics in your currently-selected workspace at the top of the list. The status of this idea was out of date. You can learn more here: Epics.