Set a world anchor to Canvas

Hi to all,
I have 5 scenes in my hololens project and everytime I change the scene, the position of the scene changes. According to that I want to fix my canvas of the scene and I tried to use WorldAnchors but it isn't possible to attach a anchor to a canvas.
Is there another solution to prevent the scenes from changing their position after each scene load?

Greetings,
Chris