How to setup a freeform trajectory in impress ? [closed]

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Hi,

I would like in LibnreOffice Impress 5.2.3.3 (windows version) move an object (i.e. picture) according to a curve I would specify. In https://help.libreoffice.org/Impress/..., it says to select the "freeform" trajectory yet I can't find it, I just see predefined animation such as "S-Curve 1", "Right", "Parallelogram". I can modify some of the animations but not to the extent where I could create a freeform curve.

Regards Matt

EDIT: the animation system seems broken in several ways :'( 1/ If you select one trajectory, an arrow picturing trajectory is drawen, then if you select a different one, the previewed trajectory is not updated, you have to change slide and go back to see it updated 2/ if you modify trajectories by double click -> moving control points, it is not always saved while changing the bounding box seems ok.