Reorder overlapping objects
Objects automatically stack in separate layers as you add them. To change the order of overlapping objectsA single element of your document. An object can be a text box, an imported graphic, a shape, a picture, and so on., you can move the layers forward and backward.
On the Home tab, under Format, click Arrange, and then click Reorder Overlapping Objects.
If Reorder Overlapping Objects is not available
Drag the layer forward or backward to place it where you want it, and then click OK.
Note If the object you are trying to bring forward or move back is not showing in the layers, the object might be part of the slide layout in Slide Master view.