Paste the following text in Windows Explorer Address bar:
%userprofile%\%AppData%\Autodesk\Revit\
Then select the folder for your flavour of Revit.
e.g.
C:\Users\Antony\AppData\Roaming\Autodesk\Revit 2015
Copy file: UIState.dat
Paste in the same location on the computer you want to transfer it to.