Summary: Using transitions view is not possible. Followed the steps from: https://doc.qt.io/qtdesignstudio/qtquick-transition-editor.html

Steps to reproduce: 

1. Create two states for element with States editor

2. Change some value in the other state

1. Open Transitions editor
2. Click on the plus icon to create transition

Expected result:

Transitions can be created & easing curve can be edited

Actual result:

You get error dialog and don't know how to fix it