You can re-order your layers in three ways:

1- You can hover over an element's name in the timeline to display the [rearrange] button. By clicking and dragging you can move that layer up or down.

2- You can modify the element's [Style Z-Index] value. The higher the number, the further to the top the element will be.

3- You can use the contextual menu on the stage to move your element front and back.

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