Mendix has a Disable setting that comments out (skips execution of the Activity) the Activity on the Microflow.
Whether Disable is set or not can be determined by the transparency of the Activity. However, this representation is not very friendly to developers who are colorblind or who do not know about Disable.
Therefore, I propose the following change.
1. Mark Activity as well as Bleak Point.
2. Or, the words "CommentOut" should be displayed on the Activity.