I think the tool is really cool. Good job!
Some small tips (if you like):
In the left side of the screens add a space for better visualization.
Increase the thickness of the horizontal scroll bar for most easy ‘click and drag’ (now is difficult to center and click).
The highlighted labes create confusion when many events and many actions have been triggered.
When an action already exists, a new action is added on top of the existing one. It would be better if it was added below.
It would be desirable to be able to copy and paste existing widgets from one project to another.
SquareLine Studio 1.0.3