How to use IEnumerable as a navigation property instead of IList

How to use IEnumerable as a navigation property, I don't want to expose a List for the client developer and give him extra distracted,undesirable functionalities like Clear(),CopyTo().

So I did the following :

 private readonly List<WorkTime> _assignedWorkTimes;

 public virtual IEnumerable<WorkTime> AssignedWorkTimes { get => _assignedWorkTimes; }

But When I use EF Power tool to render the model I see no relationship between the two entities.

Note: I make a unidirectional relationship (based on DDD recommendations) with only a Foreign key in Worktime to facilitate the data operations.