How can the pivot point of the Spin animation be moved in Impress?

Hi all. This is my first post here. Thank you for the wonderful info available here. I searched for my question but apparently no one asked for it before!

I want to animate a rectangle to spin from an initial position do a final one. Every time I select the Emphasis spin animation, the rectangle can only pivot from its centre. How can I move that pivot point to one of the corners so that the spin is executed from there?

Hi,

To change the pivot point, drag the small circle in the center of the object to a new location.

Impress : Rotating Objects
https://help.libreoffice.org/latest/en-US/text/sdraw/guide/rotate_object.html?DbPAR=IMPRESS

That I know. What I need is, as I explain in my initial post, how to do that as an animation.

Could someone please provide some help?