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Rectangle Tool
The Rectangle toolThe "Rectangle Tool" draws outline rectangles. The interior of the outline rectangle is transparent.

To draw a rectangle, click on the tool, then click a point on the icon where you want one corner to be, then
drag diagonally and release the mouse where you want the opposite corner to be.

Example:

InstanceHere's a composition creating using only the rectangles with outline.

Hotkey for using this Tool is CTRL + R.