Edit relation by clicking on arrow

[djstrong]

It would be helpful to click on relation arrow or its label and this relation to be selected in Relations window to edit or delete.

[iam-akshay]

I would suggest an another solution, what if when user click on arrow or existing relation then show a dropdown with all other relations to change it. With this, user don't need to search particular relation at RHS and can easily add/update a relation directly from arrow of relation.

[djstrong]

Yes, it would be more comfortable.