Multiple VFX assets cannot be opened in one go

How to reproduce:

1. Create 2 VFX assets in project browser
2. Drag them to the Scene View
3. Select both of them in the Hierarchy
4. Observe the Inspector

Expected result: Edit button is available, and clicking on it opens selected gameobjects in separate windows

Actual result: Edit button is greyed out

 

Note: This is for sake to reduce clicking