Here's a screenshot of what the right click menu looks like right now. There used to be a turn off adapter option until half an hour ago, I don't know where it just went...
Other than that, there was also a turn off adapter option when I clicked "Open Settings" in the above right click menu. This also has disappeared.
It used to be where I drew the rectangle:
When I tried to turn off bluetooth from the right click menu, nothing happened.
When I tried to turn it off via the settings dialog, it gave an error saying something along the lines of "Can't save discoverability settings" and did not turn off the adapter. The option to turn it off just disappeared, so I can't get that exact error. I'll try rebooting my computer to see if it comes back.
Also, the laptop manufacturer had an System Control Manager application that managed keyboard lighting, display brightness, ejecting the CD, and also had an option to turn off WiFi or bluetooth. I did not test it in the default Windows 8.1 installation, but after I downgraded to Win7, the SCM option to turn off bluetooth also does not work.