To set a specific starting point to start the scene with, user must use the Reset offset bar [on top right pane, below File (Image or VIdeo)] or have to set the values manually in the Reset Offset field.
Make sure you are dragging the offset bar towards right or left of it, to set the position and not the scene in the preview screen.
Also, Make sure the Enable head reset on scene change option is enabled under Scene Settings.
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