I'm running Moodle 2.6, and see the following in this documentation:
Different themes may be set according to 'device type' - default, legacy (for older browsers), mobile and tablet.
Go to Administration > Site administration > Appearance > Themes > Theme selector
Click on the "Select theme" button next to the type you wish to change...
I've gone to this area of my Moodle installation, and see the title "Select theme for device", but underneath is just a list of themes with a "Use theme" button next to each one.
In other words, there doesn't seem to be anywhere to choose a specific type of device.
Am I misunderstanding the documentation, or is something missing from my site?