Thunkable gives you the ability to layer components on top of one another, similar to how layers work on Photoshop and other image editing tools.
This is very easy to do - all you need to remember is that the higher up a component is in the component tree the higher it is in the stack of layers.
For example, in this first image the blue button is layered on top of the red button…
…while in the second image the red button is on top of the blue button:
These are the same components, positions, dimensions etc. the only thing that has changed is their location in the component tree.