Z Order Elements

Z Order refers to the sequence in which elements are layered through the depth of the diagram; each element on the diagram has a specific Z-order number that - when elements overlap - determines which elements the selected element displays over, and which underneath. You can move an element:

One place further back, deeper into the diagram
One place further forward, towards the front of the diagram
To the bottom of the diagram (deeper in than all other elements in the diagram)
To the top of the diagram (further forward than all other elements in the diagram)

Access

Ribbon	Layout > Alignment > choose either 'Bring to Front' or 'Send to Back'
Context Menu	Right-click on element \| Z-Order : Select the appropriate option to reposition the selected element.

Notes

This option enables you to change the Z order of a single element approximately in relation to the rest of the diagram; you can also select the 'Modify Z Order' option from the diagram context menu, to review and adjust the Z Order of each element on the diagram precisely relative to each other element
On a diagram, you can move the focus from element to element according to Z Order, by pressing Shift+Tab; each time you press these keys, the element with the next-lowest Z Order number is selected

Learn more

Diagram Context Menu