The function "Rotate zero point" is located in the toolbar:

This function is used to rotate the axis. Setting the zero point is a useful function when you need to add or edit elements that are not parallel to the X/Y axis. It is possible to set the zero point with the mouse.

Mouse button (R) on the function → In the zero point window, click on the measurement icon → Determine X or Y by 2 points → The new axis is defined