In Pixera, each Layer needs to have a so called Home Screen that it is linked to. The Home Screen acts as a reference for the Layer and also defines its origin in the Workspace. Basically it defines on which screen a layer should be rendered primarily, but does not limit rendering to that specific screen. Depending on the set Screen Presence it will also be rendered on other screens, if it is scaled or moved across different screens in the Workspace.
The Home Screen of a Layer can be defined or changed in the Inspector under Current Home Screen after selecting the layer in the Timeline.