The systems file LastParams.dat sets the columns width.  

Start by closing all cimatron sessions.
1). Navigate to C:\Program Data\3D systems\Cimatron\13.0\Data folder.  Delete the LastParams.dat file.  Restart Cimatron, and set your columns one more time.  As soon as you adjust and hit the green check it will write a new LastParams.dat file.

2).  If you really want to be sure that this doesn't change later on you can lock the file as Read Only.  This is done by modifying the file properties in windows.