Compix Persona treats the layering of 3D and 2D objects differently.
Adjusting 2D Objects
There are multiple options for adjusting the layer of 2D objects. Use the layering options on your upper Toolbar shown in the image below. These settings can also be accessed when right-clicking on the object itself.
The layering of 2D objects can be manipulated in the Timeline as well. Find your selected object in the Timeline then left click and drag it to the appropriate position.
Adjusting 3D Objects
To adjust the layering of 3D objects, you will need to adjust them using the Z-axis in the Attributes tab.