Go to the Window Menu/Bars and make sure that the Colour line is checked.
Welcome to the forum. Is that the Knoxville of "Daddy's Gone To Knoxville" (Mark Knopfler) and "Knoxville Girl" (The Handsome Family) fame?
EDIT: Actually, I may have misunderstood your question, perhaps you mean the Colour and Line Editor which is located at the bottom left of the workspace. (See attached thumbnail)
Saludos,
Bob.
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