I have a stray area selection line that shoots off the page toward the Tools Window. This line remains on screen even after a new tool has been selected and used.
The selection area shape created using the Polygon tool was not "closed" before the selection of a new tool. That stray line is pointing directly at the new tool selection.
Select the Polygon tool again and complete the selection. You can either return back to the starting point and click once or double click the mouse anywhere on screen to have the selection auto close.
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