You can go into the Music Library:
>Right Click on any Column header.
>You will see Bit Rate about half way down, check that.
>Re-size your columns to allow the new column to show.
If...You want to move the columns to your preference, down below Bit Rate you will see More...>Click that, and a new preference box will open, and you can move the columns to where ever you like.
My pix shows after I clicked on More...And then moved bit rate to the first position.