I have suddenly started seeing two thin vertical lines in koreader. They start from a cm at the bottom and go to about a cm at the top. They are about a cm from the left and right edge respectively. They are there in epub and pdf. They do not appear anywhere else on the ereader, only in koreader. Did I accedentally turn on a setting in koreader? I am using koreader on a nook glowlight 3.
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