Can not remove this straight line

Why this straight line is showing ?? and I can’t remove it. If anyone knows how to remove it, pls help me…and my Audacity version is 3.0.5
Screenshot (27)_LI.jpg

Maybe a slight variation of this bug? Audio track. The 'track cursor' has white reflections on the track at the high-scaling level. · Issue #1770 · audacity/audacity · GitHub