On the "manage tasks" screen in Compose for Data Warehouse, there is a toggle switch to show either "All" mappings or "Enabled Only" mappings. The "Enabled Only" setting should filter the list or logical entities, not just blank out the mappings that are not enabled.
This would make it much easier to see and work with the mappings that are enabled for a task. As it stands, you still have to scroll through the list of all logical entities to find the enabled mappings. This is very cumbersome when there a large number of logical entities.
If there is a reason for the current UI behavior, then another option would be to add a third choice labeled "Filter to Enabled Only" that filters the list of logical entities to those where at least one mapping for the entity is enabled in the task.