Show relationships only relevant to the selected label

**Is your feature request related to a problem? Please describe.**
Very frustrated when need to mark many relationships and everything just overlaps. Hard to audit the quality of the relationships. Right now I have to fish all relationships in the lower right corner of the screen, scrolling the list of relationships and clicking one by one.

**Describe the solution you'd like**
Whenever I click the **label** (not relationship link) I should see only relationships that are relevant to that label. All other relationships should have opacity 0.05

**Screenshot**