You can redirect one directory to another using the command prompt to create a junction. For example, if you want to use "D:\FFXIV Data\" as your game settings directory,
Press Windows key
type: cmd
Press Enter
This will create a directory junction at "D:\FFXIV Data", which is sort of a virtual directory or an alias that points to the original XIV game data directory in your documents (hereafter "TOGDDir"). Navigating into "D:\FFXIV Data" will show that you are in "D:\FFXIV Data" but you will see the contents of TOGDDir. Any changes you make inside "D:\FFXIV Data" will be actual changes to files in TOGDDir.Code:mklink /J "D:\FFXIV Data" "C:\Users\rongway\Documents\My Games\FINAL FANTASY XIV - A Realm Reborn"
It's also possible to junction in the opposite direction instead. Move all your data to "D:\FFXIV Data", delete TOGDDir, then mklink /J in the other direction. In this case, the game would believe it's still saving data to TOGDDir, but the data would actually be going to "D:\FFXIV Data".
In either case, both paths will be valid ways to get to your data, and the file explorer will show your location as whichever of the paths you used. The difference will be where the data is actually stored.
Undoing the junction is as simple as deleting the virtual folder. This will remove the link without affecting the files in the original location.