Since Singapore Granado Espada updated to v6.3, the ChangeCamera(1) function no longer works. (See Navigate Camera & Show State.) However, there is another function that does the same thing.
Add the following to your user-defined hot keys by opening the .xml file with Notepad:
Restart the client, and turn it on/off when pressing Ctrl-F1. Ensure that you do not have more than 1 function assigned to the same hot key. This function also works in Sword 2 client v5.0.23.
Thanks to PhoenixDragon and his/her anonymous (as requested) informer of IAH forums for the update.
Reassign Hot Keys
The new patch (v5.0) updates the game user interface, and added several new functions. You can edit the hot key file and reassign the hot keys by changing the Key and UseAlt/Ctrl/Shift parameters. For example, I find it too troublesome to press 2 buttons (Alt + F3) to access Town Movement, so I swapped its hot key with Keyboard Help (F12). The default setting for both functions are: