First open the elevation where you want to see the internals.

In the "Elevation" option on the top right of the screen, click on the drop down next to it and you will see an option "Elevation 1 (Wall)". Click on that to view the elevation.

In the toolbar section, go to the "View" tab and click on the "Enable Rich Elevation" option. The elevation view will now show the finishes of your cabinets/walls etc.

You can now add this to your presentations as well.

Sample rich wall elevation view attached below,