Exchange Site Template
Select any template of your choice.
Tip: Use PC 5.0 (the latest version)
Tap on the green button to enable template
When enabled, you should see a blue successful pop-up on the top right hand corner.
Select Update button on the top right hand corner to publish the changes.
Configurating Exchange Site Menu
Horizontal ( + ) creates new menu tab
Vertical ( + )creates sub-menu tab