I know how to rotate an object in Draw.io because usually there is an anchor where my mouse changes into the rotation mode. This is also explained in this tutorial:
https://support.draw.io/display/DO/Tutorial+3+-+Connectors%2C+Waypoints%2C+and+Altering+Shapes
However, a curve does not have this option:
Naturally, I could manually move every vertex, but I would prefer to have options to flip/rotate it as a whole.
I tried grabbing the curve with Ctrl, or Alt, or Shift, hoping that it would change from "move object mode" to "rotate object mode" but it does not work that way.
Best Answer
when done delete that extra object