How to remove drop shadow border of a shape in Preview

There's this drop shadow border whenever I draw a rectangle in Preview even if I set both the border and the foreground to white. Is there a way to remove or not the draw a shape without this border?

An alternative solution is to use a blank textbox with a white foreground but it's quite inconvenient as I can't easily adjust it's height and width.

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There's an option for drop shadow at the bottom of the line width dropdown:

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