How to rotate a curve in Draw.io?

Question

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.

Answer 1

• add one more object
• press down and hold CTRL
• select your curved line and that object
• press CTRL + G
• rotate it as you desire with that rotational arrow

• when done delete that extra object